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Re-enable multi-E10S when not debugging ServiceWorkers?

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When I started experimenting with ServiceWorkers in Firefox Developer Edition recently, I consented to disabling multi-E10S, but now it seems to be stuck on disabled even when I don't have about:debugging open and debugging a ServiceWorker. I've tried changing a few of the prefs in about:config as suggested for accessibility stuff that may disable it, but no luck. I'd love to get my performance back. :|

Bug for reference: https://bugzilla.mozilla.org/show_bug.cgi?id=1345932

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Have you tried setting the browser.tabs.remote.autostart preference to true? There may also be some sub-preferences like browser.tabs.remote.autostart.2 that should also be set to true.

NOTE: You will need to restart Firefox in order for the changes to take effect.
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Only browser.tabs.remote. is used in current Firefox releases. If there are still other bold autostart prefs then you can reset them via the right-click context menu.

Maybe check this pref:

  • dom.ipc.processCount

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