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(2) In the search box above the list, type or paste autos and pause while the list is filtered Click the button promising to be careful. (1) In a new tab, type or paste about:config in the address bar and press Enter/Return.
To help evaluate whether that feature is causing problems, you could turn it off as follows: In the first table on the page, check the row for "Multiprocess Windows" and see whether the number on the left side of the fraction is greater than zero. type or paste about:support in the address bar and press Enter/Return.(menu bar) Help > Troubleshooting Information."3-bar" menu button > "?" button > Troubleshooting Information.You can check whether you have this feature turned on as follows. Multiprocess creates a second firefox.exe or plugin-container.exe process to isolate the web content from the browser UI. Firefox assess whether your current configuration is compatible during the first run - first run after installation or first run after a Refresh - and if it is, enables it going forward for future runs. Recent versions of Firefox are migrating more users to a "multiprocess" architecture where the user interface and the web content are in separate processes to improve stability. (1) turn off Exploit Protection in Malwarebytes (either completely or for Firefox (firefox.exe)), or It appears to be a conflict between Firefox's multiprocess feature and the Malwarebytes Exploit Protection feature. After a Refresh, Firefox works normally until it is closed and started again. have reported being unable to connect to any sites and the upper right "X" button not working.
TURN OFF MALWAREBYTES PREMIUM UPDATE
Recent Windows 10 update + Norton security + Malwarebytes Premium
Possibly something that's been going around this month: several users with this combination.