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Now that few people use it, major sites are not just no longer testing on Firefox they are actively blocking it. Slack, for instance.

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Source? I've been using Slack through Firefox for years, and I remember only one issue - huddles didn't work at the beginning, but it was a minor one, since I use Zoom.

Huddles worked just fine if you spoofed the user agent, they actively blocked the functionality on firefox.

I went back and investigated: Huddles is blocked and I was using a user agent switcher to get around it. Then I had to switch back to Firefox agent string so Google Meet would work. Apparently my user agent switcher has out of date agent strings for Firefox so Slack started blocking me entirely.

So Slack was blocking me entirely because it thought I was using an out of date Firefox but using the default user agent string it works again.

I use Slack on Firefox for over 3 years now, without any issues. I've never seen any blocking attempt.

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