This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Re-enable multi-E10S when not debugging ServiceWorkers?

  • 2 replies
  • 1 has this problem
  • 27 views
  • Last reply by cor-el

more options

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

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

All Replies (2)

more options

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.
more options

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

Modified by cor-el