How to upgrade Font Awesome(4.7.0 -> free 5.0.6) in ExtJS6.5

The result of the following steps is on GitHub.
extjs-package-fontawesome

STEPS

1. Get Font Awesome zip file

Download the new version(free 5.0.6) as zip file from the Font Awesome official page
Font Awesome
Unzip it into an arbitrary folder

2. Replace font files

Remove everything from <project_home>/ext(framework_dir)/packages/font-awesome/resources/fonts/
Copy everything from fontawesome-free-5.0.6/web-fonts-with-css/webfonts/ to <project_home>/ext(framework_dir)/packages/font-awesome/resources/fonts/

3. Replace sass files

Remove everything from <project_home>/ext(framework_dir)/packages/font-awesome/sass/etc/, except all.scss
Copy everything from fontawesome-free-5.0.6/web-fonts-with-css/scss/ to <project_home>/ext(framework_dir)/packages/font-awesome/sass/etc/

4. Edit `/sass/etc/all.scss`

Edit <project_home>/ext(framework_dir)/packages/font-awesome/sass/etc/all.scss as follows

Add blocks of the following to the end

/sass/etc/all.scss

@import "fa-brands.scss";
@import "fa-regular.scss";
@import "fa-solid.scss";

5. Edit `/sass/src/all.scss`

Edit <project_home>/ext(framework_dir)/packages/font-awesome/sass/src/all.scss as follows
Delete row of @import "../etc/_path.scss";

Replace a block of the following
from

/sass/src/all.scss

.#{$prefix}fa:before {
    font-family: FontAwesome !important;
}

to

/sass/src/all.scss

.#{$prefix}fa,
.#{$prefix}fas {
    &:before {
        font-family: 'Font Awesome 5 Free' !important;
        font-weight: 900;
    }
}
.#{$prefix}far:before {
    font-family: 'Font Awesome 5 Free' !important;
    font-weight: 400;
}
.#{$prefix}fab:before {
    font-family: 'Font Awesome 5 Brands' !important;
}

6. Edit `/sass/etc/_icons.scss`

Edit <project_home>/ext(framework_dir)/packages/font-awesome/sass/etc/_icons.scss as follows

Add blocks of the following to the top

/sass/etc/_icons.scss

$ext-fa-vars-important: dynamic(true);

@mixin ext-declare-fa-var($value) {
    @if $ext-fa-vars-important {
        content: "#{$value}" !important;
    } @else {
        content: "#{$value}";
    }
}

Replace all
content: fa\-content -> @include ext-declare-fa-var

Icon Name Changes Complete List as a reference, add blocks of the following to the end

/sass/etc/_icons.scss

// porting from older version
.#{$fa-css-prefix}-address-book-o:before { @include ext-declare-fa-var($fa-var-address-book-o); }
.#{$fa-css-prefix}-address-card-o:before { @include ext-declare-fa-var($fa-var-address-card-o); }
.#{$fa-css-prefix}-area-chart:before { @include ext-declare-fa-var($fa-var-area-chart); }
.#{$fa-css-prefix}-arrow-circle-o-down:before { @include ext-declare-fa-var($fa-var-arrow-circle-o-down); }
.#{$fa-css-prefix}-arrow-circle-o-left:before { @include ext-declare-fa-var($fa-var-arrow-circle-o-left); }
.#{$fa-css-prefix}-arrow-circle-o-right:before { @include ext-declare-fa-var($fa-var-arrow-circle-o-right); }
.#{$fa-css-prefix}-arrow-circle-o-up:before { @include ext-declare-fa-var($fa-var-arrow-circle-o-up); }
.#{$fa-css-prefix}-arrows-alt:before { @include ext-declare-fa-var($fa-var-arrows-alt); }
.#{$fa-css-prefix}-arrows-h:before { @include ext-declare-fa-var($fa-var-arrows-h); }
.#{$fa-css-prefix}-arrows-v:before { @include ext-declare-fa-var($fa-var-arrows-v); }
.#{$fa-css-prefix}-arrows:before { @include ext-declare-fa-var($fa-var-arrows); }
.#{$fa-css-prefix}-asl-interpreting:before { @include ext-declare-fa-var($fa-var-asl-interpreting); }
.#{$fa-css-prefix}-automobile:before { @include ext-declare-fa-var($fa-var-automobile); }
.#{$fa-css-prefix}-bank:before { @include ext-declare-fa-var($fa-var-bank); }
.#{$fa-css-prefix}-bar-chart-o:before { @include ext-declare-fa-var($fa-var-bar-chart-o); }
.#{$fa-css-prefix}-bar-chart:before { @include ext-declare-fa-var($fa-var-bar-chart); }
.#{$fa-css-prefix}-bathtub:before { @include ext-declare-fa-var($fa-var-bathtub); }
.#{$fa-css-prefix}-battery-0:before { @include ext-declare-fa-var($fa-var-battery-0); }
.#{$fa-css-prefix}-battery-1:before { @include ext-declare-fa-var($fa-var-battery-1); }
.#{$fa-css-prefix}-battery-2:before { @include ext-declare-fa-var($fa-var-battery-2); }
.#{$fa-css-prefix}-battery-3:before { @include ext-declare-fa-var($fa-var-battery-3); }
.#{$fa-css-prefix}-battery-4:before { @include ext-declare-fa-var($fa-var-battery-4); }
.#{$fa-css-prefix}-battery:before { @include ext-declare-fa-var($fa-var-battery); }
.#{$fa-css-prefix}-bell-o:before { @include ext-declare-fa-var($fa-var-bell-o); }
.#{$fa-css-prefix}-bell-slash-o:before { @include ext-declare-fa-var($fa-var-bell-slash-o); }
.#{$fa-css-prefix}-bitbucket-square:before { @include ext-declare-fa-var($fa-var-bitbucket-square); }
.#{$fa-css-prefix}-bitcoin:before { @include ext-declare-fa-var($fa-var-bitcoin); }
.#{$fa-css-prefix}-bookmark-o:before { @include ext-declare-fa-var($fa-var-bookmark-o); }
.#{$fa-css-prefix}-building-o:before { @include ext-declare-fa-var($fa-var-building-o); }
.#{$fa-css-prefix}-cab:before { @include ext-declare-fa-var($fa-var-cab); }
.#{$fa-css-prefix}-calendar-check-o:before { @include ext-declare-fa-var($fa-var-calendar-check-o); }
.#{$fa-css-prefix}-calendar-minus-o:before { @include ext-declare-fa-var($fa-var-calendar-minus-o); }
.#{$fa-css-prefix}-calendar-o:before { @include ext-declare-fa-var($fa-var-calendar-o); }
.#{$fa-css-prefix}-calendar-plus-o:before { @include ext-declare-fa-var($fa-var-calendar-plus-o); }
.#{$fa-css-prefix}-calendar-times-o:before { @include ext-declare-fa-var($fa-var-calendar-times-o); }
.#{$fa-css-prefix}-calendar:before { @include ext-declare-fa-var($fa-var-calendar); }
.#{$fa-css-prefix}-caret-square-o-down:before { @include ext-declare-fa-var($fa-var-caret-square-o-down); }
.#{$fa-css-prefix}-caret-square-o-left:before { @include ext-declare-fa-var($fa-var-caret-square-o-left); }
.#{$fa-css-prefix}-caret-square-o-right:before { @include ext-declare-fa-var($fa-var-caret-square-o-right); }
.#{$fa-css-prefix}-caret-square-o-up:before { @include ext-declare-fa-var($fa-var-caret-square-o-up); }
.#{$fa-css-prefix}-cc:before { @include ext-declare-fa-var($fa-var-cc); }
.#{$fa-css-prefix}-chain-broken:before { @include ext-declare-fa-var($fa-var-chain-broken); }
.#{$fa-css-prefix}-chain:before { @include ext-declare-fa-var($fa-var-chain); }
.#{$fa-css-prefix}-check-circle-o:before { @include ext-declare-fa-var($fa-var-check-circle-o); }
.#{$fa-css-prefix}-check-square-o:before { @include ext-declare-fa-var($fa-var-check-square-o); }
.#{$fa-css-prefix}-circle-o-notch:before { @include ext-declare-fa-var($fa-var-circle-o-notch); }
.#{$fa-css-prefix}-circle-o:before { @include ext-declare-fa-var($fa-var-circle-o); }
.#{$fa-css-prefix}-circle-thin:before { @include ext-declare-fa-var($fa-var-circle-thin); }
.#{$fa-css-prefix}-clock-o:before { @include ext-declare-fa-var($fa-var-clock-o); }
.#{$fa-css-prefix}-close:before { @include ext-declare-fa-var($fa-var-close); }
.#{$fa-css-prefix}-cloud-download:before { @include ext-declare-fa-var($fa-var-cloud-download); }
.#{$fa-css-prefix}-cloud-upload:before { @include ext-declare-fa-var($fa-var-cloud-upload); }
.#{$fa-css-prefix}-cny:before { @include ext-declare-fa-var($fa-var-cny); }
.#{$fa-css-prefix}-code-fork:before { @include ext-declare-fa-var($fa-var-code-fork); }
.#{$fa-css-prefix}-comment-o:before { @include ext-declare-fa-var($fa-var-comment-o); }
.#{$fa-css-prefix}-commenting-o:before { @include ext-declare-fa-var($fa-var-commenting-o); }
.#{$fa-css-prefix}-commenting:before { @include ext-declare-fa-var($fa-var-commenting); }
.#{$fa-css-prefix}-comments-o:before { @include ext-declare-fa-var($fa-var-comments-o); }
.#{$fa-css-prefix}-credit-card-alt:before { @include ext-declare-fa-var($fa-var-credit-card-alt); }
.#{$fa-css-prefix}-cutlery:before { @include ext-declare-fa-var($fa-var-cutlery); }
.#{$fa-css-prefix}-dashboard:before { @include ext-declare-fa-var($fa-var-dashboard); }
.#{$fa-css-prefix}-deafness:before { @include ext-declare-fa-var($fa-var-deafness); }
.#{$fa-css-prefix}-dedent:before { @include ext-declare-fa-var($fa-var-dedent); }
.#{$fa-css-prefix}-diamond:before { @include ext-declare-fa-var($fa-var-diamond); }
.#{$fa-css-prefix}-dollar:before { @include ext-declare-fa-var($fa-var-dollar); }
.#{$fa-css-prefix}-dot-circle-o:before { @include ext-declare-fa-var($fa-var-dot-circle-o); }
.#{$fa-css-prefix}-drivers-license-o:before { @include ext-declare-fa-var($fa-var-drivers-license-o); }
.#{$fa-css-prefix}-drivers-license:before { @include ext-declare-fa-var($fa-var-drivers-license); }
.#{$fa-css-prefix}-eercast:before { @include ext-declare-fa-var($fa-var-eercast); }
.#{$fa-css-prefix}-envelope-o:before { @include ext-declare-fa-var($fa-var-envelope-o); }
.#{$fa-css-prefix}-envelope-open-o:before { @include ext-declare-fa-var($fa-var-envelope-open-o); }
.#{$fa-css-prefix}-eur:before { @include ext-declare-fa-var($fa-var-eur); }
.#{$fa-css-prefix}-euro:before { @include ext-declare-fa-var($fa-var-euro); }
.#{$fa-css-prefix}-exchange:before { @include ext-declare-fa-var($fa-var-exchange); }
.#{$fa-css-prefix}-external-link-square:before { @include ext-declare-fa-var($fa-var-external-link-square); }
.#{$fa-css-prefix}-external-link:before { @include ext-declare-fa-var($fa-var-external-link); }
.#{$fa-css-prefix}-eyedropper:before { @include ext-declare-fa-var($fa-var-eyedropper); }
.#{$fa-css-prefix}-fa:before { @include ext-declare-fa-var($fa-var-fa); }
.#{$fa-css-prefix}-facebook-f:before { @include ext-declare-fa-var($fa-var-facebook-f); }
.#{$fa-css-prefix}-facebook-official:before { @include ext-declare-fa-var($fa-var-facebook-official); }
.#{$fa-css-prefix}-facebook:before { @include ext-declare-fa-var($fa-var-facebook); }
.#{$fa-css-prefix}-feed:before { @include ext-declare-fa-var($fa-var-feed); }
.#{$fa-css-prefix}-file-archive-o:before { @include ext-declare-fa-var($fa-var-file-archive-o); }
.#{$fa-css-prefix}-file-audio-o:before { @include ext-declare-fa-var($fa-var-file-audio-o); }
.#{$fa-css-prefix}-file-code-o:before { @include ext-declare-fa-var($fa-var-file-code-o); }
.#{$fa-css-prefix}-file-excel-o:before { @include ext-declare-fa-var($fa-var-file-excel-o); }
.#{$fa-css-prefix}-file-image-o:before { @include ext-declare-fa-var($fa-var-file-image-o); }
.#{$fa-css-prefix}-file-movie-o:before { @include ext-declare-fa-var($fa-var-file-movie-o); }
.#{$fa-css-prefix}-file-o:before { @include ext-declare-fa-var($fa-var-file-o); }
.#{$fa-css-prefix}-file-pdf-o:before { @include ext-declare-fa-var($fa-var-file-pdf-o); }
.#{$fa-css-prefix}-file-photo-o:before { @include ext-declare-fa-var($fa-var-file-photo-o); }
.#{$fa-css-prefix}-file-picture-o:before { @include ext-declare-fa-var($fa-var-file-picture-o); }
.#{$fa-css-prefix}-file-powerpoint-o:before { @include ext-declare-fa-var($fa-var-file-powerpoint-o); }
.#{$fa-css-prefix}-file-sound-o:before { @include ext-declare-fa-var($fa-var-file-sound-o); }
.#{$fa-css-prefix}-file-text-o:before { @include ext-declare-fa-var($fa-var-file-text-o); }
.#{$fa-css-prefix}-file-text:before { @include ext-declare-fa-var($fa-var-file-text); }
.#{$fa-css-prefix}-file-video-o:before { @include ext-declare-fa-var($fa-var-file-video-o); }
.#{$fa-css-prefix}-file-word-o:before { @include ext-declare-fa-var($fa-var-file-word-o); }
.#{$fa-css-prefix}-file-zip-o:before { @include ext-declare-fa-var($fa-var-file-zip-o); }
.#{$fa-css-prefix}-files-o:before { @include ext-declare-fa-var($fa-var-files-o); }
.#{$fa-css-prefix}-flag-o:before { @include ext-declare-fa-var($fa-var-flag-o); }
.#{$fa-css-prefix}-flash:before { @include ext-declare-fa-var($fa-var-flash); }
.#{$fa-css-prefix}-floppy-o:before { @include ext-declare-fa-var($fa-var-floppy-o); }
.#{$fa-css-prefix}-folder-o:before { @include ext-declare-fa-var($fa-var-folder-o); }
.#{$fa-css-prefix}-folder-open-o:before { @include ext-declare-fa-var($fa-var-folder-open-o); }
.#{$fa-css-prefix}-frown-o:before { @include ext-declare-fa-var($fa-var-frown-o); }
.#{$fa-css-prefix}-futbol-o:before { @include ext-declare-fa-var($fa-var-futbol-o); }
.#{$fa-css-prefix}-gbp:before { @include ext-declare-fa-var($fa-var-gbp); }
.#{$fa-css-prefix}-ge:before { @include ext-declare-fa-var($fa-var-ge); }
.#{$fa-css-prefix}-gear:before { @include ext-declare-fa-var($fa-var-gear); }
.#{$fa-css-prefix}-gears:before { @include ext-declare-fa-var($fa-var-gears); }
.#{$fa-css-prefix}-gittip:before { @include ext-declare-fa-var($fa-var-gittip); }
.#{$fa-css-prefix}-glass:before { @include ext-declare-fa-var($fa-var-glass); }
.#{$fa-css-prefix}-google-plus-circle:before { @include ext-declare-fa-var($fa-var-google-plus-circle); }
.#{$fa-css-prefix}-google-plus-official:before { @include ext-declare-fa-var($fa-var-google-plus-official); }
.#{$fa-css-prefix}-google-plus:before { @include ext-declare-fa-var($fa-var-google-plus); }
.#{$fa-css-prefix}-group:before { @include ext-declare-fa-var($fa-var-group); }
.#{$fa-css-prefix}-hand-grab-o:before { @include ext-declare-fa-var($fa-var-hand-grab-o); }
.#{$fa-css-prefix}-hand-lizard-o:before { @include ext-declare-fa-var($fa-var-hand-lizard-o); }
.#{$fa-css-prefix}-hand-o-down:before { @include ext-declare-fa-var($fa-var-hand-o-down); }
.#{$fa-css-prefix}-hand-o-left:before { @include ext-declare-fa-var($fa-var-hand-o-left); }
.#{$fa-css-prefix}-hand-o-right:before { @include ext-declare-fa-var($fa-var-hand-o-right); }
.#{$fa-css-prefix}-hand-o-up:before { @include ext-declare-fa-var($fa-var-hand-o-up); }
.#{$fa-css-prefix}-hand-paper-o:before { @include ext-declare-fa-var($fa-var-hand-paper-o); }
.#{$fa-css-prefix}-hand-peace-o:before { @include ext-declare-fa-var($fa-var-hand-peace-o); }
.#{$fa-css-prefix}-hand-pointer-o:before { @include ext-declare-fa-var($fa-var-hand-pointer-o); }
.#{$fa-css-prefix}-hand-rock-o:before { @include ext-declare-fa-var($fa-var-hand-rock-o); }
.#{$fa-css-prefix}-hand-scissors-o:before { @include ext-declare-fa-var($fa-var-hand-scissors-o); }
.#{$fa-css-prefix}-hand-spock-o:before { @include ext-declare-fa-var($fa-var-hand-spock-o); }
.#{$fa-css-prefix}-hand-stop-o:before { @include ext-declare-fa-var($fa-var-hand-stop-o); }
.#{$fa-css-prefix}-handshake-o:before { @include ext-declare-fa-var($fa-var-handshake-o); }
.#{$fa-css-prefix}-hard-of-hearing:before { @include ext-declare-fa-var($fa-var-hard-of-hearing); }
.#{$fa-css-prefix}-hdd-o:before { @include ext-declare-fa-var($fa-var-hdd-o); }
.#{$fa-css-prefix}-header:before { @include ext-declare-fa-var($fa-var-header); }
.#{$fa-css-prefix}-heart-o:before { @include ext-declare-fa-var($fa-var-heart-o); }
.#{$fa-css-prefix}-hospital-o:before { @include ext-declare-fa-var($fa-var-hospital-o); }
.#{$fa-css-prefix}-hotel:before { @include ext-declare-fa-var($fa-var-hotel); }
.#{$fa-css-prefix}-hourglass-1:before { @include ext-declare-fa-var($fa-var-hourglass-1); }
.#{$fa-css-prefix}-hourglass-2:before { @include ext-declare-fa-var($fa-var-hourglass-2); }
.#{$fa-css-prefix}-hourglass-3:before { @include ext-declare-fa-var($fa-var-hourglass-3); }
.#{$fa-css-prefix}-hourglass-o:before { @include ext-declare-fa-var($fa-var-hourglass-o); }
.#{$fa-css-prefix}-id-card-o:before { @include ext-declare-fa-var($fa-var-id-card-o); }
.#{$fa-css-prefix}-ils:before { @include ext-declare-fa-var($fa-var-ils); }
.#{$fa-css-prefix}-image:before { @include ext-declare-fa-var($fa-var-image); }
.#{$fa-css-prefix}-inr:before { @include ext-declare-fa-var($fa-var-inr); }
.#{$fa-css-prefix}-institution:before { @include ext-declare-fa-var($fa-var-institution); }
.#{$fa-css-prefix}-intersex:before { @include ext-declare-fa-var($fa-var-intersex); }
.#{$fa-css-prefix}-jpy:before { @include ext-declare-fa-var($fa-var-jpy); }
.#{$fa-css-prefix}-keyboard-o:before { @include ext-declare-fa-var($fa-var-keyboard-o); }
.#{$fa-css-prefix}-krw:before { @include ext-declare-fa-var($fa-var-krw); }
.#{$fa-css-prefix}-legal:before { @include ext-declare-fa-var($fa-var-legal); }
.#{$fa-css-prefix}-lemon-o:before { @include ext-declare-fa-var($fa-var-lemon-o); }
.#{$fa-css-prefix}-level-down:before { @include ext-declare-fa-var($fa-var-level-down); }
.#{$fa-css-prefix}-level-up:before { @include ext-declare-fa-var($fa-var-level-up); }
.#{$fa-css-prefix}-life-bouy:before { @include ext-declare-fa-var($fa-var-life-bouy); }
.#{$fa-css-prefix}-life-buoy:before { @include ext-declare-fa-var($fa-var-life-buoy); }
.#{$fa-css-prefix}-life-saver:before { @include ext-declare-fa-var($fa-var-life-saver); }
.#{$fa-css-prefix}-lightbulb-o:before { @include ext-declare-fa-var($fa-var-lightbulb-o); }
.#{$fa-css-prefix}-line-chart:before { @include ext-declare-fa-var($fa-var-line-chart); }
.#{$fa-css-prefix}-linkedin-square:before { @include ext-declare-fa-var($fa-var-linkedin-square); }
.#{$fa-css-prefix}-linkedin:before { @include ext-declare-fa-var($fa-var-linkedin); }
.#{$fa-css-prefix}-long-arrow-down:before { @include ext-declare-fa-var($fa-var-long-arrow-down); }
.#{$fa-css-prefix}-long-arrow-left:before { @include ext-declare-fa-var($fa-var-long-arrow-left); }
.#{$fa-css-prefix}-long-arrow-right:before { @include ext-declare-fa-var($fa-var-long-arrow-right); }
.#{$fa-css-prefix}-long-arrow-up:before { @include ext-declare-fa-var($fa-var-long-arrow-up); }
.#{$fa-css-prefix}-mail-forward:before { @include ext-declare-fa-var($fa-var-mail-forward); }
.#{$fa-css-prefix}-mail-reply-all:before { @include ext-declare-fa-var($fa-var-mail-reply-all); }
.#{$fa-css-prefix}-mail-reply:before { @include ext-declare-fa-var($fa-var-mail-reply); }
.#{$fa-css-prefix}-map-marker:before { @include ext-declare-fa-var($fa-var-map-marker); }
.#{$fa-css-prefix}-map-o:before { @include ext-declare-fa-var($fa-var-map-o); }
.#{$fa-css-prefix}-meanpath:before { @include ext-declare-fa-var($fa-var-meanpath); }
.#{$fa-css-prefix}-meh-o:before { @include ext-declare-fa-var($fa-var-meh-o); }
.#{$fa-css-prefix}-minus-square-o:before { @include ext-declare-fa-var($fa-var-minus-square-o); }
.#{$fa-css-prefix}-mobile-phone:before { @include ext-declare-fa-var($fa-var-mobile-phone); }
.#{$fa-css-prefix}-mobile:before { @include ext-declare-fa-var($fa-var-mobile); }
.#{$fa-css-prefix}-money:before { @include ext-declare-fa-var($fa-var-money); }
.#{$fa-css-prefix}-moon-o:before { @include ext-declare-fa-var($fa-var-moon-o); }
.#{$fa-css-prefix}-mortar-board:before { @include ext-declare-fa-var($fa-var-mortar-board); }
.#{$fa-css-prefix}-navicon:before { @include ext-declare-fa-var($fa-var-navicon); }
.#{$fa-css-prefix}-newspaper-o:before { @include ext-declare-fa-var($fa-var-newspaper-o); }
.#{$fa-css-prefix}-paper-plane-o:before { @include ext-declare-fa-var($fa-var-paper-plane-o); }
.#{$fa-css-prefix}-paste:before { @include ext-declare-fa-var($fa-var-paste); }
.#{$fa-css-prefix}-pause-circle-o:before { @include ext-declare-fa-var($fa-var-pause-circle-o); }
.#{$fa-css-prefix}-pencil-square-o:before { @include ext-declare-fa-var($fa-var-pencil-square-o); }
.#{$fa-css-prefix}-pencil-square:before { @include ext-declare-fa-var($fa-var-pencil-square); }
.#{$fa-css-prefix}-pencil:before { @include ext-declare-fa-var($fa-var-pencil); }
.#{$fa-css-prefix}-photo:before { @include ext-declare-fa-var($fa-var-photo); }
.#{$fa-css-prefix}-picture-o:before { @include ext-declare-fa-var($fa-var-picture-o); }
.#{$fa-css-prefix}-pie-chart:before { @include ext-declare-fa-var($fa-var-pie-chart); }
.#{$fa-css-prefix}-play-circle-o:before { @include ext-declare-fa-var($fa-var-play-circle-o); }
.#{$fa-css-prefix}-plus-square-o:before { @include ext-declare-fa-var($fa-var-plus-square-o); }
.#{$fa-css-prefix}-question-circle-o:before { @include ext-declare-fa-var($fa-var-question-circle-o); }
.#{$fa-css-prefix}-ra:before { @include ext-declare-fa-var($fa-var-ra); }
.#{$fa-css-prefix}-refresh:before { @include ext-declare-fa-var($fa-var-refresh); }
.#{$fa-css-prefix}-remove:before { @include ext-declare-fa-var($fa-var-remove); }
.#{$fa-css-prefix}-reorder:before { @include ext-declare-fa-var($fa-var-reorder); }
.#{$fa-css-prefix}-repeat:before { @include ext-declare-fa-var($fa-var-repeat); }
.#{$fa-css-prefix}-resistance:before { @include ext-declare-fa-var($fa-var-resistance); }
.#{$fa-css-prefix}-rmb:before { @include ext-declare-fa-var($fa-var-rmb); }
.#{$fa-css-prefix}-rotate-left:before { @include ext-declare-fa-var($fa-var-rotate-left); }
.#{$fa-css-prefix}-rotate-right:before { @include ext-declare-fa-var($fa-var-rotate-right); }
.#{$fa-css-prefix}-rouble:before { @include ext-declare-fa-var($fa-var-rouble); }
.#{$fa-css-prefix}-rub:before { @include ext-declare-fa-var($fa-var-rub); }
.#{$fa-css-prefix}-ruble:before { @include ext-declare-fa-var($fa-var-ruble); }
.#{$fa-css-prefix}-rupee:before { @include ext-declare-fa-var($fa-var-rupee); }
.#{$fa-css-prefix}-s15:before { @include ext-declare-fa-var($fa-var-s15); }
.#{$fa-css-prefix}-scissors:before { @include ext-declare-fa-var($fa-var-scissors); }
.#{$fa-css-prefix}-send-o:before { @include ext-declare-fa-var($fa-var-send-o); }
.#{$fa-css-prefix}-send:before { @include ext-declare-fa-var($fa-var-send); }
.#{$fa-css-prefix}-share-square-o:before { @include ext-declare-fa-var($fa-var-share-square-o); }
.#{$fa-css-prefix}-shekel:before { @include ext-declare-fa-var($fa-var-shekel); }
.#{$fa-css-prefix}-sheqel:before { @include ext-declare-fa-var($fa-var-sheqel); }
.#{$fa-css-prefix}-shield:before { @include ext-declare-fa-var($fa-var-shield); }
.#{$fa-css-prefix}-sign-in:before { @include ext-declare-fa-var($fa-var-sign-in); }
.#{$fa-css-prefix}-sign-out:before { @include ext-declare-fa-var($fa-var-sign-out); }
.#{$fa-css-prefix}-signing:before { @include ext-declare-fa-var($fa-var-signing); }
.#{$fa-css-prefix}-sliders:before { @include ext-declare-fa-var($fa-var-sliders); }
.#{$fa-css-prefix}-smile-o:before { @include ext-declare-fa-var($fa-var-smile-o); }
.#{$fa-css-prefix}-snowflake-o:before { @include ext-declare-fa-var($fa-var-snowflake-o); }
.#{$fa-css-prefix}-soccer-ball-o:before { @include ext-declare-fa-var($fa-var-soccer-ball-o); }
.#{$fa-css-prefix}-sort-alpha-asc:before { @include ext-declare-fa-var($fa-var-sort-alpha-asc); }
.#{$fa-css-prefix}-sort-alpha-desc:before { @include ext-declare-fa-var($fa-var-sort-alpha-desc); }
.#{$fa-css-prefix}-sort-amount-asc:before { @include ext-declare-fa-var($fa-var-sort-amount-asc); }
.#{$fa-css-prefix}-sort-amount-desc:before { @include ext-declare-fa-var($fa-var-sort-amount-desc); }
.#{$fa-css-prefix}-sort-asc:before { @include ext-declare-fa-var($fa-var-sort-asc); }
.#{$fa-css-prefix}-sort-desc:before { @include ext-declare-fa-var($fa-var-sort-desc); }
.#{$fa-css-prefix}-sort-numeric-asc:before { @include ext-declare-fa-var($fa-var-sort-numeric-asc); }
.#{$fa-css-prefix}-sort-numeric-desc:before { @include ext-declare-fa-var($fa-var-sort-numeric-desc); }
.#{$fa-css-prefix}-spoon:before { @include ext-declare-fa-var($fa-var-spoon); }
.#{$fa-css-prefix}-square-o:before { @include ext-declare-fa-var($fa-var-square-o); }
.#{$fa-css-prefix}-star-half-empty:before { @include ext-declare-fa-var($fa-var-star-half-empty); }
.#{$fa-css-prefix}-star-half-full:before { @include ext-declare-fa-var($fa-var-star-half-full); }
.#{$fa-css-prefix}-star-half-o:before { @include ext-declare-fa-var($fa-var-star-half-o); }
.#{$fa-css-prefix}-star-o:before { @include ext-declare-fa-var($fa-var-star-o); }
.#{$fa-css-prefix}-sticky-note-o:before { @include ext-declare-fa-var($fa-var-sticky-note-o); }
.#{$fa-css-prefix}-stop-circle-o:before { @include ext-declare-fa-var($fa-var-stop-circle-o); }
.#{$fa-css-prefix}-sun-o:before { @include ext-declare-fa-var($fa-var-sun-o); }
.#{$fa-css-prefix}-support:before { @include ext-declare-fa-var($fa-var-support); }
.#{$fa-css-prefix}-tablet:before { @include ext-declare-fa-var($fa-var-tablet); }
.#{$fa-css-prefix}-tachometer:before { @include ext-declare-fa-var($fa-var-tachometer); }
.#{$fa-css-prefix}-television:before { @include ext-declare-fa-var($fa-var-television); }
.#{$fa-css-prefix}-thermometer-0:before { @include ext-declare-fa-var($fa-var-thermometer-0); }
.#{$fa-css-prefix}-thermometer-1:before { @include ext-declare-fa-var($fa-var-thermometer-1); }
.#{$fa-css-prefix}-thermometer-2:before { @include ext-declare-fa-var($fa-var-thermometer-2); }
.#{$fa-css-prefix}-thermometer-3:before { @include ext-declare-fa-var($fa-var-thermometer-3); }
.#{$fa-css-prefix}-thermometer-4:before { @include ext-declare-fa-var($fa-var-thermometer-4); }
.#{$fa-css-prefix}-thermometer:before { @include ext-declare-fa-var($fa-var-thermometer); }
.#{$fa-css-prefix}-thumb-tack:before { @include ext-declare-fa-var($fa-var-thumb-tack); }
.#{$fa-css-prefix}-thumbs-o-down:before { @include ext-declare-fa-var($fa-var-thumbs-o-down); }
.#{$fa-css-prefix}-thumbs-o-up:before { @include ext-declare-fa-var($fa-var-thumbs-o-up); }
.#{$fa-css-prefix}-ticket:before { @include ext-declare-fa-var($fa-var-ticket); }
.#{$fa-css-prefix}-times-circle-o:before { @include ext-declare-fa-var($fa-var-times-circle-o); }
.#{$fa-css-prefix}-times-rectangle-o:before { @include ext-declare-fa-var($fa-var-times-rectangle-o); }
.#{$fa-css-prefix}-times-rectangle:before { @include ext-declare-fa-var($fa-var-times-rectangle); }
.#{$fa-css-prefix}-toggle-down:before { @include ext-declare-fa-var($fa-var-toggle-down); }
.#{$fa-css-prefix}-toggle-left:before { @include ext-declare-fa-var($fa-var-toggle-left); }
.#{$fa-css-prefix}-toggle-right:before { @include ext-declare-fa-var($fa-var-toggle-right); }
.#{$fa-css-prefix}-toggle-up:before { @include ext-declare-fa-var($fa-var-toggle-up); }
.#{$fa-css-prefix}-trash-o:before { @include ext-declare-fa-var($fa-var-trash-o); }
.#{$fa-css-prefix}-trash:before { @include ext-declare-fa-var($fa-var-trash); }
.#{$fa-css-prefix}-try:before { @include ext-declare-fa-var($fa-var-try); }
.#{$fa-css-prefix}-turkish-lira:before { @include ext-declare-fa-var($fa-var-turkish-lira); }
.#{$fa-css-prefix}-unsorted:before { @include ext-declare-fa-var($fa-var-unsorted); }
.#{$fa-css-prefix}-usd:before { @include ext-declare-fa-var($fa-var-usd); }
.#{$fa-css-prefix}-user-circle-o:before { @include ext-declare-fa-var($fa-var-user-circle-o); }
.#{$fa-css-prefix}-user-o:before { @include ext-declare-fa-var($fa-var-user-o); }
.#{$fa-css-prefix}-vcard-o:before { @include ext-declare-fa-var($fa-var-vcard-o); }
.#{$fa-css-prefix}-vcard:before { @include ext-declare-fa-var($fa-var-vcard); }
.#{$fa-css-prefix}-video-camera:before { @include ext-declare-fa-var($fa-var-video-camera); }
.#{$fa-css-prefix}-vimeo:before { @include ext-declare-fa-var($fa-var-vimeo); }
.#{$fa-css-prefix}-volume-control-phone:before { @include ext-declare-fa-var($fa-var-volume-control-phone); }
.#{$fa-css-prefix}-warning:before { @include ext-declare-fa-var($fa-var-warning); }
.#{$fa-css-prefix}-wechat:before { @include ext-declare-fa-var($fa-var-wechat); }
.#{$fa-css-prefix}-wheelchair-alt:before { @include ext-declare-fa-var($fa-var-wheelchair-alt); }
.#{$fa-css-prefix}-window-close-o:before { @include ext-declare-fa-var($fa-var-window-close-o); }
.#{$fa-css-prefix}-won:before { @include ext-declare-fa-var($fa-var-won); }
.#{$fa-css-prefix}-y-combinator-square:before { @include ext-declare-fa-var($fa-var-y-combinator-square); }
.#{$fa-css-prefix}-yc-square:before { @include ext-declare-fa-var($fa-var-yc-square); }
.#{$fa-css-prefix}-yc:before { @include ext-declare-fa-var($fa-var-yc); }
.#{$fa-css-prefix}-yen:before { @include ext-declare-fa-var($fa-var-yen); }
.#{$fa-css-prefix}-youtube-play:before { @include ext-declare-fa-var($fa-var-youtube-play); }
.#{$fa-css-prefix}-youtube-square:before { @include ext-declare-fa-var($fa-var-youtube-square); }

7. Edit `/sass/etc/_variables.scss`

Edit <project_home>/ext(framework_dir)/packages/font-awesome/sass/etc/_variables.scss as follows

Icon Name Changes Complete List as a reference, add blocks of the following to the end

/sass/etc/_variables.scss

// define vars used to use in older version to point to new vars
$fa-var-address-book-o: $fa-var-address-book;
$fa-var-address-card-o: $fa-var-address-card;
$fa-var-area-chart: $fa-var-chart-area;
$fa-var-arrow-circle-o-down: $fa-var-arrow-alt-circle-down;
$fa-var-arrow-circle-o-left: $fa-var-arrow-alt-circle-left;
$fa-var-arrow-circle-o-right: $fa-var-arrow-alt-circle-right;
$fa-var-arrow-circle-o-up: $fa-var-arrow-alt-circle-up;
$fa-var-arrows-alt: $fa-var-expand-arrows-alt;
$fa-var-arrows-h: $fa-var-arrows-alt-h;
$fa-var-arrows-v: $fa-var-arrows-alt-v;
$fa-var-arrows: $fa-var-arrows-alt;
$fa-var-asl-interpreting: $fa-var-american-sign-language-interpreting;
$fa-var-automobile: $fa-var-car;
$fa-var-bank: $fa-var-university;
$fa-var-bar-chart-o: $fa-var-chart-bar;
$fa-var-bar-chart: $fa-var-chart-bar;
$fa-var-bathtub: $fa-var-bath;
$fa-var-battery-0: $fa-var-battery-empty;
$fa-var-battery-1: $fa-var-battery-quarter;
$fa-var-battery-2: $fa-var-battery-half;
$fa-var-battery-3: $fa-var-battery-three-quarters;
$fa-var-battery-4: $fa-var-battery-full;
$fa-var-battery: $fa-var-battery-full;
$fa-var-bell-o: $fa-var-bell;
$fa-var-bell-slash-o: $fa-var-bell-slash;
$fa-var-bitbucket-square: $fa-var-bitbucket;
$fa-var-bitcoin: $fa-var-btc;
$fa-var-bookmark-o: $fa-var-bookmark;
$fa-var-building-o: $fa-var-building;
$fa-var-cab: $fa-var-taxi;
$fa-var-calendar-check-o: $fa-var-calendar-check;
$fa-var-calendar-minus-o: $fa-var-calendar-minus;
$fa-var-calendar-o: $fa-var-calendar;
$fa-var-calendar-plus-o: $fa-var-calendar-plus;
$fa-var-calendar-times-o: $fa-var-calendar-times;
$fa-var-calendar: $fa-var-calendar-alt;
$fa-var-caret-square-o-down: $fa-var-caret-square-down;
$fa-var-caret-square-o-left: $fa-var-caret-square-left;
$fa-var-caret-square-o-right: $fa-var-caret-square-right;
$fa-var-caret-square-o-up: $fa-var-caret-square-up;
$fa-var-cc: $fa-var-closed-captioning;
$fa-var-chain-broken: $fa-var-unlink;
$fa-var-chain: $fa-var-link;
$fa-var-check-circle-o: $fa-var-check-circle;
$fa-var-check-square-o: $fa-var-check-square;
$fa-var-circle-o-notch: $fa-var-circle-notch;
$fa-var-circle-o: $fa-var-circle;
$fa-var-circle-thin: $fa-var-circle;
$fa-var-clock-o: $fa-var-clock;
$fa-var-close: $fa-var-times;
$fa-var-cloud-download: $fa-var-cloud-download-alt;
$fa-var-cloud-upload: $fa-var-cloud-upload-alt;
$fa-var-cny: $fa-var-yen-sign;
$fa-var-code-fork: $fa-var-code-branch;
$fa-var-comment-o: $fa-var-comment;
$fa-var-commenting-o: $fa-var-comment-alt;
$fa-var-commenting: $fa-var-comment-alt;
$fa-var-comments-o: $fa-var-comments;
$fa-var-credit-card-alt: $fa-var-credit-card;
$fa-var-cutlery: $fa-var-utensils;
$fa-var-dashboard: $fa-var-tachometer-alt;
$fa-var-deafness: $fa-var-deaf;
$fa-var-dedent: $fa-var-outdent;
$fa-var-diamond: $fa-var-gem;
$fa-var-dollar: $fa-var-dollar-sign;
$fa-var-dot-circle-o: $fa-var-dot-circle;
$fa-var-drivers-license-o: $fa-var-id-card;
$fa-var-drivers-license: $fa-var-id-card;
$fa-var-eercast: $fa-var-sellcast;
$fa-var-envelope-o: $fa-var-envelope;
$fa-var-envelope-open-o: $fa-var-envelope-open;
$fa-var-eur: $fa-var-euro-sign;
$fa-var-euro: $fa-var-euro-sign;
$fa-var-exchange: $fa-var-exchange-alt;
$fa-var-external-link-square: $fa-var-external-link-square-alt;
$fa-var-external-link: $fa-var-external-link-alt;
$fa-var-eyedropper: $fa-var-eye-dropper;
$fa-var-fa: $fa-var-font-awesome;
$fa-var-facebook-f: $fa-var-facebook-f;
$fa-var-facebook-official: $fa-var-facebook;
$fa-var-facebook: $fa-var-facebook-f;
$fa-var-feed: $fa-var-rss;
$fa-var-file-archive-o: $fa-var-file-archive;
$fa-var-file-audio-o: $fa-var-file-audio;
$fa-var-file-code-o: $fa-var-file-code;
$fa-var-file-excel-o: $fa-var-file-excel;
$fa-var-file-image-o: $fa-var-file-image;
$fa-var-file-movie-o: $fa-var-file-video;
$fa-var-file-o: $fa-var-file;
$fa-var-file-pdf-o: $fa-var-file-pdf;
$fa-var-file-photo-o: $fa-var-file-image;
$fa-var-file-picture-o: $fa-var-file-image;
$fa-var-file-powerpoint-o: $fa-var-file-powerpoint;
$fa-var-file-sound-o: $fa-var-file-audio;
$fa-var-file-text-o: $fa-var-file-alt;
$fa-var-file-text: $fa-var-file-alt;
$fa-var-file-video-o: $fa-var-file-video;
$fa-var-file-word-o: $fa-var-file-word;
$fa-var-file-zip-o: $fa-var-file-archive;
$fa-var-files-o: $fa-var-copy;
$fa-var-flag-o: $fa-var-flag;
$fa-var-flash: $fa-var-bolt;
$fa-var-floppy-o: $fa-var-save;
$fa-var-folder-o: $fa-var-folder;
$fa-var-folder-open-o: $fa-var-folder-open;
$fa-var-frown-o: $fa-var-frown;
$fa-var-futbol-o: $fa-var-futbol;
$fa-var-gbp: $fa-var-pound-sign;
$fa-var-ge: $fa-var-empire;
$fa-var-gear: $fa-var-cog;
$fa-var-gears: $fa-var-cogs;
$fa-var-gittip: $fa-var-gratipay;
$fa-var-glass: $fa-var-glass-martini;
$fa-var-google-plus-circle: $fa-var-google-plus;
$fa-var-google-plus-official: $fa-var-google-plus;
$fa-var-google-plus: $fa-var-google-plus-g;
$fa-var-group: $fa-var-users;
$fa-var-hand-grab-o: $fa-var-hand-rock;
$fa-var-hand-lizard-o: $fa-var-hand-lizard;
$fa-var-hand-o-down: $fa-var-hand-point-down;
$fa-var-hand-o-left: $fa-var-hand-point-left;
$fa-var-hand-o-right: $fa-var-hand-point-right;
$fa-var-hand-o-up: $fa-var-hand-point-up;
$fa-var-hand-paper-o: $fa-var-hand-paper;
$fa-var-hand-peace-o: $fa-var-hand-peace;
$fa-var-hand-pointer-o: $fa-var-hand-pointer;
$fa-var-hand-rock-o: $fa-var-hand-rock;
$fa-var-hand-scissors-o: $fa-var-hand-scissors;
$fa-var-hand-spock-o: $fa-var-hand-spock;
$fa-var-hand-stop-o: $fa-var-hand-paper;
$fa-var-handshake-o: $fa-var-handshake;
$fa-var-hard-of-hearing: $fa-var-deaf;
$fa-var-hdd-o: $fa-var-hdd;
$fa-var-header: $fa-var-heading;
$fa-var-heart-o: $fa-var-heart;
$fa-var-hospital-o: $fa-var-hospital;
$fa-var-hotel: $fa-var-bed;
$fa-var-hourglass-1: $fa-var-hourglass-start;
$fa-var-hourglass-2: $fa-var-hourglass-half;
$fa-var-hourglass-3: $fa-var-hourglass-end;
$fa-var-hourglass-o: $fa-var-hourglass;
$fa-var-id-card-o: $fa-var-id-card;
$fa-var-ils: $fa-var-shekel-sign;
$fa-var-image: $fa-var-image;
$fa-var-inr: $fa-var-rupee-sign;
$fa-var-institution: $fa-var-university;
$fa-var-intersex: $fa-var-transgender;
$fa-var-jpy: $fa-var-yen-sign;
$fa-var-keyboard-o: $fa-var-keyboard;
$fa-var-krw: $fa-var-won-sign;
$fa-var-legal: $fa-var-gavel;
$fa-var-lemon-o: $fa-var-lemon;
$fa-var-level-down: $fa-var-level-down-alt;
$fa-var-level-up: $fa-var-level-up-alt;
$fa-var-life-bouy: $fa-var-life-ring;
$fa-var-life-buoy: $fa-var-life-ring;
$fa-var-life-saver: $fa-var-life-ring;
$fa-var-lightbulb-o: $fa-var-lightbulb;
$fa-var-line-chart: $fa-var-chart-line;
$fa-var-linkedin-square: $fa-var-linkedin;
$fa-var-linkedin: $fa-var-linkedin-in;
$fa-var-long-arrow-down: $fa-var-long-arrow-alt-down;
$fa-var-long-arrow-left: $fa-var-long-arrow-alt-left;
$fa-var-long-arrow-right: $fa-var-long-arrow-alt-right;
$fa-var-long-arrow-up: $fa-var-long-arrow-alt-up;
$fa-var-mail-forward: $fa-var-share;
$fa-var-mail-reply-all: $fa-var-reply-all;
$fa-var-mail-reply: $fa-var-reply;
$fa-var-map-marker: $fa-var-map-marker-alt;
$fa-var-map-o: $fa-var-map;
$fa-var-meanpath: $fa-var-font-awesome;
$fa-var-meh-o: $fa-var-meh;
$fa-var-minus-square-o: $fa-var-minus-square;
$fa-var-mobile-phone: $fa-var-mobile-alt;
$fa-var-mobile: $fa-var-mobile-alt;
$fa-var-money: $fa-var-money-bill-alt;
$fa-var-moon-o: $fa-var-moon;
$fa-var-mortar-board: $fa-var-graduation-cap;
$fa-var-navicon: $fa-var-bars;
$fa-var-newspaper-o: $fa-var-newspaper;
$fa-var-paper-plane-o: $fa-var-paper-plane;
$fa-var-paste: $fa-var-clipboard;
$fa-var-pause-circle-o: $fa-var-pause-circle;
$fa-var-pencil-square-o: $fa-var-edit;
$fa-var-pencil-square: $fa-var-pen-square;
$fa-var-pencil: $fa-var-pencil-alt;
$fa-var-photo: $fa-var-image;
$fa-var-picture-o: $fa-var-image;
$fa-var-pie-chart: $fa-var-chart-pie;
$fa-var-play-circle-o: $fa-var-play-circle;
$fa-var-plus-square-o: $fa-var-plus-square;
$fa-var-question-circle-o: $fa-var-question-circle;
$fa-var-ra: $fa-var-rebel;
$fa-var-refresh: $fa-var-sync;
$fa-var-remove: $fa-var-times;
$fa-var-reorder: $fa-var-bars;
$fa-var-repeat: $fa-var-redo;
$fa-var-resistance: $fa-var-rebel;
$fa-var-rmb: $fa-var-yen-sign;
$fa-var-rotate-left: $fa-var-undo;
$fa-var-rotate-right: $fa-var-redo;
$fa-var-rouble: $fa-var-ruble-sign;
$fa-var-rub: $fa-var-ruble-sign;
$fa-var-ruble: $fa-var-ruble-sign;
$fa-var-rupee: $fa-var-rupee-sign;
$fa-var-s15: $fa-var-bath;
$fa-var-scissors: $fa-var-cut;
$fa-var-send-o: $fa-var-paper-plane;
$fa-var-send: $fa-var-paper-plane;
$fa-var-share-square-o: $fa-var-share-square;
$fa-var-shekel: $fa-var-shekel-sign;
$fa-var-sheqel: $fa-var-shekel-sign;
$fa-var-shield: $fa-var-shield-alt;
$fa-var-sign-in: $fa-var-sign-in-alt;
$fa-var-sign-out: $fa-var-sign-out-alt;
$fa-var-signing: $fa-var-sign-language;
$fa-var-sliders: $fa-var-sliders-h;
$fa-var-smile-o: $fa-var-smile;
$fa-var-snowflake-o: $fa-var-snowflake;
$fa-var-soccer-ball-o: $fa-var-futbol;
$fa-var-sort-alpha-asc: $fa-var-sort-alpha-down;
$fa-var-sort-alpha-desc: $fa-var-sort-alpha-up;
$fa-var-sort-amount-asc: $fa-var-sort-amount-down;
$fa-var-sort-amount-desc: $fa-var-sort-amount-up;
$fa-var-sort-asc: $fa-var-sort-up;
$fa-var-sort-desc: $fa-var-sort-down;
$fa-var-sort-numeric-asc: $fa-var-sort-numeric-down;
$fa-var-sort-numeric-desc: $fa-var-sort-numeric-up;
$fa-var-spoon: $fa-var-utensil-spoon;
$fa-var-square-o: $fa-var-square;
$fa-var-star-half-empty: $fa-var-star-half;
$fa-var-star-half-full: $fa-var-star-half;
$fa-var-star-half-o: $fa-var-star-half;
$fa-var-star-o: $fa-var-star;
$fa-var-sticky-note-o: $fa-var-sticky-note;
$fa-var-stop-circle-o: $fa-var-stop-circle;
$fa-var-sun-o: $fa-var-sun;
$fa-var-support: $fa-var-life-ring;
$fa-var-tablet: $fa-var-tablet-alt;
$fa-var-tachometer: $fa-var-tachometer-alt;
$fa-var-television: $fa-var-tv;
$fa-var-thermometer-0: $fa-var-thermometer-empty;
$fa-var-thermometer-1: $fa-var-thermometer-quarter;
$fa-var-thermometer-2: $fa-var-thermometer-half;
$fa-var-thermometer-3: $fa-var-thermometer-three-quarters;
$fa-var-thermometer-4: $fa-var-thermometer-full;
$fa-var-thermometer: $fa-var-thermometer-full;
$fa-var-thumb-tack: $fa-var-thumbtack;
$fa-var-thumbs-o-down: $fa-var-thumbs-down;
$fa-var-thumbs-o-up: $fa-var-thumbs-up;
$fa-var-ticket: $fa-var-ticket-alt;
$fa-var-times-circle-o: $fa-var-times-circle;
$fa-var-times-rectangle-o: $fa-var-window-close;
$fa-var-times-rectangle: $fa-var-window-close;
$fa-var-toggle-down: $fa-var-caret-square-down;
$fa-var-toggle-left: $fa-var-caret-square-left;
$fa-var-toggle-right: $fa-var-caret-square-right;
$fa-var-toggle-up: $fa-var-caret-square-up;
$fa-var-trash-o: $fa-var-trash-alt;
$fa-var-trash: $fa-var-trash-alt;
$fa-var-try: $fa-var-lira-sign;
$fa-var-turkish-lira: $fa-var-lira-sign;
$fa-var-unsorted: $fa-var-sort;
$fa-var-usd: $fa-var-dollar-sign;
$fa-var-user-circle-o: $fa-var-user-circle;
$fa-var-user-o: $fa-var-user;
$fa-var-vcard-o: $fa-var-address-card;
$fa-var-vcard: $fa-var-address-card;
$fa-var-video-camera: $fa-var-video;
$fa-var-vimeo: $fa-var-vimeo-v;
$fa-var-volume-control-phone: $fa-var-phone-volume;
$fa-var-warning: $fa-var-exclamation-triangle;
$fa-var-wechat: $fa-var-weixin;
$fa-var-wheelchair-alt: $fa-var-accessible-icon;
$fa-var-window-close-o: $fa-var-window-close;
$fa-var-won: $fa-var-won-sign;
$fa-var-y-combinator-square: $fa-var-hacker-news;
$fa-var-yc-square: $fa-var-hacker-news;
$fa-var-yc: $fa-var-y-combinator;
$fa-var-yen: $fa-var-yen-sign;
$fa-var-youtube-play: $fa-var-youtube;
$fa-var-youtube-square: $fa-var-youtube;

Add //# fashion directive of the following to the first line
/sass/etc/_variables.scss
```
//# fashion warn -elevation
```
Add //# fashion directive of the following to the last line
/sass/etc/_variables.scss
```
//# fashion warn +elevation
```

8. Edit `fa-brands.scss`, `fa-regular.scss`, `fa-solid.scss` in `/sass/etc/` (I don't know if this step is necessary)

Add //# fashion directive to each file like this.

fa-brands.scss

//# fashion -inline    <- this line
@font-face {
    font-family: 'Font Awesome 5 Brands';
    font-style: normal;
    font-weight: normal;
    src: url('#{$fa-font-path}/fa-brands-400.eot');
    //# fashion +inline:eot    <- this line
    //# fashion +inline:ttf    <- this line
    src: url('#{$fa-font-path}/fa-brands-400.eot?#iefix') format('embedded-opentype'),
    ...

9. Run `sencha app watch`