It's nothing new for Mozilla. This bug [1] about plugins capturing keys has been alive for more than 15 years now, even after getting 'major' importance level and 441 votes to fix it - which clearly shows they give little importance to these votes. Since it's one of the most annoying Firefox bugs ever and priorities are seemingly not assigned based on the advertised 'me too' votes, people resorted to writing their frustration in comments. What they did in return? They disabled comments on that thread as well, and then sat on the bug. There bureaucratic process turns off many contributors, and sometimes shows off the limitations of FOSS. Every other browser fixed that problem at one point of time, but Firefox still hasn't. New bugs for this issue are marked as duplicate of this and closed, and as a result, just get sunk into this black hole called issue 78414.
P.S. - What's the funniest thing? The bug is still marked as 'NEW'.