Issue 6504 - Remove useInlineStyles for now

lib/content/elemHideEmulation.js

Index: lib/content/elemHideEmulation.js
===================================================================
--- a/lib/content/elemHideEmulation.js
+++ b/lib/content/elemHideEmulation.js
@@ -599,17 +599,16 @@
 }
 
 function ElemHideEmulation(addSelectorsFunc, hideElemsFunc)
 {
   this.document = document;
   this.addSelectorsFunc = addSelectorsFunc;
   this.hideElemsFunc = hideElemsFunc;
   this.observer = new MutationObserver(this.observe.bind(this));
-  this.useInlineStyles = true;
 }
 
 ElemHideEmulation.prototype = {
   isSameOrigin(stylesheet)
   {
     try
     {
       return new URL(stylesheet.href).origin == this.document.location.origin;
@@ -789,40 +788,27 @@
 
         // If the pattern appears to contain any sibling combinators, we can't
         // easily optimize based on the mutation targets. Since this is a
         // special case, skip the optimization. By setting it to null here we
         // make sure we process the entire DOM.
         if (pattern.maybeContainsSiblingCombinators)
           evaluationTargets = null;
 
-        // Ignore mutation targets when using style sheets, because we may have
-        // to update all the CSS selectors.
-        if (!this.useInlineStyles)
-          evaluationTargets = null;
-
         generator = evaluate(pattern.selectors, 0, "",
                              this.document, cssStyles, evaluationTargets);
       }
       for (let selector of generator)
       {
         if (selector != null)
         {
-          if (!this.useInlineStyles)
+          for (let element of this.document.querySelectorAll(selector))
           {
-            selectors.push(selector);
-            selectorFilters.push(pattern.text);
-          }
-          else
-          {
-            for (let element of this.document.querySelectorAll(selector))
-            {
-              elements.push(element);
-              elementFilters.push(pattern.text);
-            }
+            elements.push(element);
+            elementFilters.push(pattern.text);
           }
         }
         if (performance.now() - cycleStart > MAX_SYNCHRONOUS_PROCESSING_TIME)
         {
           setTimeout(processPatterns, 0);
           return;
         }
       }