Firefox from the Snap Store becomes unresponsive and closes uncleanly
Fresh install of Ubuntu 19.10 with default install of Firefox frequently froze and closed without ending all processes, causing an error the next time I attempt to start Firefox. Uninstalling the snap version and installing through apt seems to have resolved the issue.
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I have a similar problem. I am running 18.04.2 LTS and I am interested in knowing when FF freezes is it occurring when viewing youtube?
I would recommend trying about:config then select and active the logging option to see if it displays any useful information.