On Arch Linux with GNOME 3.24.2 and Firefox 53.0.3 (soon to be upgraded to 54 when it comes into the repository) I have found in my about:support section that it says:

Multiprocess Windows    0/1 (Disabled by add-ons)

So I was wondering if there is any way that I can check which add-on(s) is doing this?

  • I can't find a profile of my where it's enabled. Even in a new blank profile with just "Ubuntu Modifications" 3.2 it shows as "Disabled by add-ons". And ... disabling that enables Multiprocess windows. Interesting. – Joe P Jun 14 '17 at 16:33
  • Try a new blank profile. If your distro or Firefox package includes any all-users add-ons (like Ubuntu does) they might be to blame. – Joe P Jun 14 '17 at 16:35
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    Ubuntu Modifications is well known for disabling e10s. One of the core priciples of Arch is that it comes straight from upstream with the least distro-specific modifications possible, so nothing is pre-installed in Firefox. – user103789 Jun 14 '17 at 16:37
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    I have learnt something! – Joe P Jun 14 '17 at 16:59

If Multiprocess Windows is listed as "Disabled by add-ons", open about:addons and disable all your add-ons, then enable them one-by-one to find which add-on is disabling e10s. Although Firefox will not allow incompatible add-ons to load - add-ons can be incompatible with e10s and thus their developers have chosen to disable e10s while their add-on is enabled.

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  • How do I know which add-on is compatible and which is not? Do I just have to manually go through it and check by disabling them all and then enabling one-by-one? – user103789 Jun 14 '17 at 16:29
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    Add-ons incompatible with the current version aren't started, so I'm unclear how they would affect multiprocess capability. – Joe P Jun 14 '17 at 16:31
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    @JoeP: VTzilla, the VirusTotal add-on. – user103789 Jun 14 '17 at 17:07
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    Out of interest was it "incompatible with the current version"? And/or already disabled? – Joe P Jun 14 '17 at 17:09
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    In my case, it was the WordReference Translator add-on – whoan Aug 9 '17 at 3:19

Try the official add-on-compatibility-reporter, it lists the compatible addons.

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