私のとっておきのJSFL。
タイムラインの空のレイヤーを一括削除するのが主な目的ですが、補助機能としてレイヤーカラーを整えます。
レイヤーカラーは適当な色になることが多いので、綺麗なflaづくりに役立ちます。

//delete empty layers

var l = 0;
var timeline = fl.getDocumentDOM().getTimeline();

execDelete();

function execDelete() {
	var layersConut = timeline.layerCount;

	if(l >= layersConut || layersConut == 1) return;
	
	var currentLayer = timeline.layers[l];
	
	//skip when layer is folder
	if(currentLayer.layerType == "folder") next(true);
		
	//check all start frame on layer
	var frameArray = currentLayer.frames;
	for (i=0; i<frameArray.length; i++) {
	   if (i == frameArray[i].startFrame) {
	   		//check empty frame
		  	if(chkFrame(frameArray[i])) next(true);
	   }
	}
	
	//delete a empty layer
	fl.getDocumentDOM().getTimeline().deleteLayer(l);
	next(false);
}

/* return true when layer is not empty*/
function chkFrame(frame)
{
	var el = frame.elements;
	var lb = frame.labelType;
	var snd = frame.soundName ;
	var as = frame.actionScript;
	
    if( el != "" || lb != "none" || snd != "" ||  as != "") {
		return true;
	}else{
		return false;
	}
}



function next(b)
{
	if(b) l++;
	execDelete();
}



// coloring
var l = 0;var timeline = fl.getDocumentDOM().getTimeline();
var max = timeline.layerCount;

for(var i=0; i<max; i++)
{
	var currentLayer = timeline.layers[i];
	var color = 0xFF * (1 - i/max);
	var resultColor = 0x0;
	
	resultColor += color << 16;
	resultColor += color << 8;
	resultColor += color << 0;
	
	currentLayer.color = resultColor;
	
	switch(currentLayer.name.toLowerCase())
	{
		case "actions":
		case "action":
		case "as":
		case "script":
			currentLayer.color = 0x990000;
			break;
		case "label":
		case "labels":
			currentLayer.color = 0x3399FF;
			break;
	}
}