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At this point, I'd create a new profile and try again. I know that you've already tried both Stable and Nightly, but there is a possibility that both of their profiles have been corrupted by some external factor. If the issue is not at the container level, then it's probably at the profile level.

https://support.mozilla.org/en-US/kb/profile-manager-create-...

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Sounds like a corrupt profile in FF. I was coming to look for a comment that mentioned this.

It does. But damn, two corrupt profiles? One on each Firefox? What is the chance of that?!

Anyway, my last attempt will be to create a new profile. I was avoiding that because it feels like quitting. It feels like destroying everything and replanting the soil hoping for a better outcome even though you have no idea what happened before.

It's just a debugging step. Don't delete your existing profile. If you confirm that it's fine in a stock profile, then you can use various methods to see what's different and find the bug (eg. “what non-default settings overrides are set in my profile”).

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