In a sense, this feature&#x2F;dialog is &quot;close&quot; to e10s as it&#x27;s under the same umbrella at Mozilla, the &quot;Snappy&quot; [1] effort to work on performance. But it&#x27;s not the same:<p>- e10s is about making each browser tab an independent process [2]. Some addons have glitches with it, but uBlock Origin is not one of them.<p>- The feature you saw just proactively tells users about addons degrading performance and help them disable them or adjust their expectations. See [3]. EDIT hmmm, you <i>are</i> right, actually! The bug explicitly mentions the goal to <i>&quot;identify add-ons that are causing jank because of their CPOW usage&quot;</i>, and CPOW is an e10s thing [4]. TIL, thanks :)<p>[1] <a href="https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;Performance&#x2F;Snappy" rel="nofollow">https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;Performance&#x2F;Snappy</a>
[2] <a href="https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;Electrolysis" rel="nofollow">https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;Electrolysis</a>
[3] <a href="https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1071880" rel="nofollow">https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=1071880</a>
[4] <a href="https:&#x2F;&#x2F;developer.mozilla.org&#x2F;en-US&#x2F;Firefox&#x2F;Multiprocess_Firefox&#x2F;Cross_Process_Object_Wrappers" rel="nofollow">https:&#x2F;&#x2F;developer.mozilla.org&#x2F;en-US&#x2F;Firefox&#x2F;Multiprocess_Fir...</a>