Index: include.preload.js
===================================================================
--- a/include.preload.js
+++ b/include.preload.js
@@ -394,20 +394,19 @@
   }
 };
 
 function ContentFiltering()
 {
   this.styles = new Map();
   this.tracer = null;
   this.inline = true;
-  this.inlineEmulated = true;
 
   this.elemHideEmulation = new ElemHideEmulation(
-    this.addSelectors.bind(this),
+    () => {},
     this.hideElements.bind(this)
   );
 }
 ContentFiltering.prototype = {
   selectorGroupSize: 1024,
 
   addSelectorsInline(selectors, groupName, appendOnly = false)
   {
@@ -457,17 +456,17 @@
       let selector = selectors.slice(i, i + this.selectorGroupSize).join(", ");
       style.sheet.insertRule(selector + "{display: none !important;}",
                              style.sheet.cssRules.length);
     }
   },
 
   addSelectors(selectors, filters, groupName = "emulated", appendOnly = false)
   {
-    if (this.inline || this.inlineEmulated)
+    if (this.inline)
     {
       // Insert the style rules inline if we have been instructed by the
       // background page to do so. This is usually the case, except on platforms
       // that do support user stylesheets via the browser.tabs.insertCSS API
       // (Firefox 53 onwards for now and possibly Chrome in the near future).
       // Once all supported platforms have implemented this API, we can remove
       // the code below. See issue #5090.
       // Related Chrome and Firefox issues:
@@ -517,29 +516,23 @@
       if (this.tracer)
         this.tracer.disconnect();
       this.tracer = null;
 
       if (response.trace)
         this.tracer = new ElementHidingTracer();
 
       this.inline = response.inline;
-      this.inlineEmulated = !!response.inlineEmulated;
 
       if (this.inline)
         this.addSelectorsInline(response.selectors, "standard");
 
       if (this.tracer)
         this.tracer.addSelectors(response.selectors);
 
-      // Prefer CSS selectors for -abp-has and -abp-contains unless the
-      // background page has asked us to use inline styles.
-      this.elemHideEmulation.useInlineStyles = this.inline ||
-                                               this.inlineEmulated;
-
       this.elemHideEmulation.apply(response.emulatedPatterns);
     });
   }
 };
 
 if (document instanceof HTMLDocument)
 {
   checkSitekey();