I've just been trying to think how long the most annoying Firefox issue I see every day has been around, it's at least 10 years and it's very disruptive - copying just will, 70% of the time, not actually copy (mostly when copying URLs, as in right click, copy link context option, but happens on other occasions too even when using ^x)

I can't be the only one suffering this, because no other application does it, although thunderbird has done on occasion but that is hardly the worst thing about it..

And then there is Firefox on Android, some genius decided to disable pull down refresh by default, not a bug I guess but more annoying than the plethora of problems.