To find out which machine Firefox is running on, type:
ls -l ~/.mozilla/firefox/*/lock

If there is a lock, it will be a symbolic link pointing to a file with the IP address of the computer where it is running followed by the process ID it is using. To translate IP-ADDRESS to a host name, type:

The process id should also be present, so type:
rsh <HOSTNAME> kill PID


For example: 

~>ls -l ~/.mozilla/firefox/*/lock

lrwxrwxrwx 1 rivin dept 20 Jan 18 14:04 /u/rivin/.mozilla/firefox/uiil642a.default/lock -> 

~>host domain name pointer 

~>rsh eagle kill 24876

Be sure to remove the lockfile if killing the process didn't!

~>rm ~/.mozilla/firefox/*/lock

If this doesn't work, you will need to delete the .parentlock file:

~>rm ~/.mozilla/firefox/*/.parentlock

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