[mattmanser]

No, it's happened on two different phones over the last 2+ years. And two completely different phones, Xiaomi and Pixel.

I do wonder how you know you closed 2,000? The UI displays an infinity symbol over 99 tabs. If you had so many open, most of those would have been moved to inactive. The inactive tab section doesn't have a count and has a button you can click to close all.

Makes me sort of wonder whether you are actually using it.

[oldmariner]

There's an option to turn off the inactive tabs feature.

Trying to "share" all of them will crash Firefox, so I manually select 100 and share those, then close those, repeat 20 times (which is how I know how many tabs I had open).