sgtlion [any]

I tend to have ~10,000 tabs because I obsessively fail to clean up. But it never takes much memory or cpu, my PC isn’t amazing yet Firefox is always lightning quick.

I’ve never used the discard or merge windows features though, I can see why those might cause issues. I assume these two functions just aren’t optimised for so many tabs.

One addon I might recommend to help keep numbers down is Duplicate Tab Closer, which has options to specify how similar tabs can be to be considered duplicates, and also will detect across all open windows if desired.

Even though we don’t use it on this instance, I do find the up vote and down vote counts the most interesting and transparent