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Firefox on macOS 10.15 stops loading webpages

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Recently updated my 2012 MacBook Pro to macOS 10.15. After Firefox has been open for a while, it stops loading webpages. The title of the page loads, the browser window goes white and never displays anything; the page attempts to load continuously and navigation buttons don't respond. Other than that, Firefox operates and responds as though nothing's wrong. Meanwhile all other browsers can navigate the web just fine. Quitting Firefox (from the menu bar) causes the windows to close but an entry remains in "Force Quit" for an extended period. It can be forced closed from here, but doing so causes further attempts to open Firefox to have no windows appear; the only way to reopen Firefox appears to be to restart the whole computer. If allowed to close the rest of the way on its own- which can take up to 10 minutes- the crash dialog appears and Firefox can be restarted.

This has continued to happen despite repairing the drive, refreshing Firefox, removing and reinstalling Firefox, disabling hardware acceleration, running in safe mode, etc. There are no extensions installed and I have not synced my Firefox account.

Modified by cor-el