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Has anyone had issues with Firefox blank page and firefox slowness

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Platform is Window10 64bit in a corporate network. We have installed Firefox version 50 then version 52 both had the same issue with some PCs. We have several issues: 1> Firefox startup page is blank and hung on some PCs 2> Firefox very slow for some Websites. We can temporary fix issue by either: 3> Rollback to Firefox version 45 4> Stop security service xagt (FireEye) for product FireEye HX Agent - Exploit Detection module and then Firefox works again. Any ideas will be appreciated e.g. what has changed in Firefox code to cause this.... Thanks

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If you use Windows 10 and Malwarebytes then you might be experiencing a conflict between Firefox's multi-process feature and the Malwarebytes Exploit Protection feature. You can do either of these to see if that has effect. (1) Malwarebytes: turn off Real-Time Protection -> Exploit Protection (2) Firefox: turn off multi-process in Firefox

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'll be careful" to continue.