Thanks Iain, I have contacted Trello Support. I noticed the button does work in a Private Firefox tab. I also tried disabling my uBlock extension for trello but the menu still wouldn't open in a non-private tab. Also uBlock appears to be running in the Private window so it doesn't seem like that's the source of the problem. I will update here when I hear back from Support.
If you had to thrive a new habit during a lockdown, what would it be? Trello
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