Does this support article help?
https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding
As the article refers to *random* freezes you might find only the Firefox snap
affected.
Please let us know which version of Firefox and which release of Ubuntu
are currently affected.
** Changed in: firefox (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2039427
Title:
Freeze of frontend page after staying inactive for few moment
Status in firefox package in Ubuntu:
Incomplete
Bug description:
I'm using Firefox snap
bug happens only in Firefox snap and won't be reproduced in other version of
Firefox
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https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2039427/+subscriptions
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