Bug 1564127 Comment 7 Edit History
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These sound related, I don't know: https://www.reddit.com/r/firefox/comments/ccno2j/cant_terminate_firefox_process_restart_required/ https://www.reddit.com/r/firefox/comments/ccpi38/firefox_broke_yesterday_and_only_showed_a_blank/ (Could also be related to bug 1565882 / bug 1514869.)