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How Mozilla lost the Internet (& what's next)
(youtube.com)
A place to discuss the news and latest developments on the open-source browser Firefox
I've had this issue on several Pixel devices - I most recently had this exact issue on my Pixel 6 Pro, but I think recent-ish Firefox updates resolved some of the issues.
In my case, Firefox would lockup, but I could easily switch to another app without an issue. I would have to kill the Firefox app to get it responsive again.