New comment by thamesynne on void-packages repository

https://github.com/void-linux/void-packages/issues/31933#issuecomment-885202857

Comment:
First, i do a `ps ax | grep fire`; that gives me a list of candidates.  Usually there are just two with the command line 'firefox' (without any options), and between them are lots of subprocesses with very long command lines full of options; it's one of the processes with no options that needs to be killed. Mostly it's the one with the higher PID that needs killing - unless there are no subprocesses between those two; then the PIDs have wrapped and the lower one needs to be killed.

I think that heuristic has only steered me wrong once, and I was in a hurry that time.

(Having said which, I've only used the 32-bt glibc version since I created this bug report, and that doesn't exhibit the problem at all.)