Index: lib/contentFiltering.js
===================================================================
--- a/lib/contentFiltering.js
+++ b/lib/contentFiltering.js
@@ -245,23 +245,16 @@
   {
     inline = true;
   }
 
   let response = {trace, inline, emulatedPatterns};
   if (trace || inline)
     response.selectors = selectors;
 
-  // If we can't remove user style sheets using tabs.removeCSS, we'll only keep
-  // adding them, which could cause problems with emulation filters as
-  // described in issue #5864. Instead, we can just ask the content script to
-  // add styles for emulation filters inline.
-  if (!styleSheetRemovalSupported)
-    response.inlineEmulated = true;
-
   return response;
 });
 
 port.on("elemhide.injectSelectors", (message, sender) =>
 {
   updateFrameStyles(sender.page.id, sender.frame.id, message.selectors,
                     message.groupName, message.appendOnly);
 });