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Why don't Facebook pop-up windows don't work in Firefox 57 (Quantum)

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  • 1 has this problem
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  • Last reply by cor-el

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After the upgrade I found Firefox 57 (Quantum) doesn't always work with some Facebook features, such as when posting converting a URL to a Website preview. Looking into this I would an article "Firefox Quantum SharedWorker not work" on Stack Overflow suggesting SharedWorkers don't work on Firefox 57 when multiprocessing is enabled. I then followed the suggest of disable functionality via the warning on about:debugging#workers page.

Was it just coincidence that this fixed the problem, or is there really some feature missing on Firefox 57 (Quantum) when multiprocessing is enabled?

After the upgrade I found Firefox 57 (Quantum) doesn't always work with some Facebook features, such as when posting converting a URL to a Website preview. Looking into this I would an article "Firefox Quantum SharedWorker not work" on Stack Overflow suggesting SharedWorkers don't work on Firefox 57 when multiprocessing is enabled. I then followed the suggest of disable functionality via the warning on about:debugging#workers page. Was it just coincidence that this fixed the problem, or is there really some feature missing on Firefox 57 (Quantum) when multiprocessing is enabled?

All Replies (3)

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Sorry, forgot to allow there was already an exception for popup windows for facebook.com, and the Stack Overflow article is here .

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Yes that is the fix, as to something missing, no idea. Firefox Support Volunteers are not told such things. Is probably being worked on, 58 brings Multi-Thread next.

If this answers your question could you please mark it as solved by you so that others will be able to find the information.

Thank You.

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You can disable multi-process windows in Firefox by setting these prefs to false on the about:config page.

  • browser.tabs.remote.autostart = false
  • browser.tabs.remote.autostart.2 = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.