Issue 5314 - Allow hide emulation filters to be with a plain selector

chrome/content/elemHideEmulation.js

Index: chrome/content/elemHideEmulation.js
===================================================================
--- a/chrome/content/elemHideEmulation.js
+++ b/chrome/content/elemHideEmulation.js
@@ -241,16 +241,18 @@
   }
   else
     regexpString = filterToRegExp(propertyExpression);
 
   this._regexp = new RegExp(regexpString, "i");
 }
 
 PropsSelector.prototype = {
+  preferHideWithSelector: true,
+
   *findPropsSelectors(styles, prefix, regexp)
   {
     for (let style of styles)
       if (regexp.test(style.style))
         for (let subSelector of style.subSelectors)
           yield prefix + subSelector;
   },
 
@@ -371,17 +373,18 @@
     }
 
     let {document} = this.window;
     for (let pattern of this.patterns)
     {
       for (let selector of evaluate(pattern.selectors,
                                     0, "", document, cssStyles))
       {
-        if (!pattern.selectors.some(s => s.requiresHiding))
+        if (pattern.selectors.some(s => s.preferHideWithSelector) &&
+            !pattern.selectors.some(s => s.requiresHiding))
         {
           selectors.push(selector);
           selectorFilters.push(pattern.text);
         }
         else
         {
           for (let element of document.querySelectorAll(selector))
           {