開発者がブラウザのバグにはなるべく対応しない事が標準的な動作を促すんじゃないだろうか。
参考
[html - Height of textarea does not match the rows in Firefox - Stack Overflow]
(http://stackoverflow.com/questions/7695945/height-of-textarea-does-not-match-the-rows-in-firefox)
html - One-row textarea in Firefox refuses to show vertical scrollbar - Stack Overflow
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