--- a/browser/base/content/test/static/browser_parsable_css.js
+++ b/browser/base/content/test/static/browser_parsable_css.js
@@ -132,24 +132,16 @@ let whitelist = [
   // These properties *are* actually referenced. Need to find why
   // their reference isn't getting counted.
   {propName: "--bezier-diagonal-color",
    isFromDevTools: true},
   {propName: "--bezier-grid-color",
    isFromDevTools: true},
 ];
 
-if (!Services.prefs.getBoolPref("full-screen-api.unprefix.enabled")) {
-  whitelist.push({
-    sourceName: /(?:res|gre-resources)\/(ua|html)\.css$/i,
-    errorMessage: /Unknown pseudo-class .*\bfullscreen\b/i,
-    isFromDevTools: false
-  });
-}
-
 // Platform can be "linux", "macosx" or "win". If omitted, the exception applies to all platforms.
 let allowedImageReferences = [
   // Bug 1302691
   {file: "chrome://devtools/skin/images/dock-bottom-minimize@2x.png",
    from: "chrome://devtools/skin/toolbox.css",
    isFromDevTools: true},
   {file: "chrome://devtools/skin/images/dock-bottom-maximize@2x.png",
    from: "chrome://devtools/skin/toolbox.css",