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When firefox crashes, sometimes lock files are left over that prevent firefox from starting again.

If you are sure that you have no firefox running on any machine, but firefox still claims to be running, find the directory named

gi32rog@zuse:~/.mozilla/firefox/w6zn9vkj.default$

where "w6zn9vkj" will differ in your case, and delete the two files "lock" and ".parentlock" 

-rw-r--r-- 1 gi32rog IntegraTUM      0 Dec 14 15:09 .parentlock
lrwxrwxrwx 1 gi32rog IntegraTUM     20 Jan 18 11:19 lock

Now firefox should start again without an error message.

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