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duplicate notifications Firefox 83 under Big Sur (YouTube problem only)

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Hey all, I've encountered a strange behavior with Firefox 83 under macOS Big Sur 11.0.1 where if I have desktop notifications enabled for YouTube enabled, I'll get duplicate notifications. For example, If I have one notification waiting from YouTube when launching Firefox, I'll see it twice when opening notification center. This doesn't happen, if Firefox is running and notifications come in, and it only happens with YouTube.

Also, This didn't seem to be a problem on Firefox 82.0.3 when I initially upgraded to Big Sur. It seems to have started with version 83.

I have completely deleted all firefox data and settings, and started fresh to confirm it wasn't corrupted settings, and it doesn't appear to be. I also asked about this in #Firefox on freenode, but after a couple hours of waiting never got an answer: so trying here today.

I've also searched, and no one else seems to have reported this issue, other than me. Is this a known issue, or am I the first? Also, is there anything I can do outside waiting for a firefox update / big sure updates? For now, I have disabled desktop notifications in YouTube settings as that's the only problem site I'm experiencing. This seems to be a firefox, and Youtube specific issue, as the latest version of Chrome is also set to deliver me notifications, and those work correctly, as well as do all other notifications, both system, and app.

If there is anything I can do to resolve this, please let me know.


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