> I also seem to have an annoying bug in mobile where after a while long tap on link no longer opens the contextual menu

I thought I was the only one. I don't have uBlock installed, but also don't really bother reporting bugs because mobile Firefox doesn't appear like a supported project to me at all (where can I find ANY documentation?).

It happens to me occasionally, but I can't say anything about my number of open tabs because it just displays "∞" (wtf man?).