Mv /.mozilla/firefox /.mozilla/firefox_old In the worst case scenario, you could do this:

Rm -f ~/.mozilla/firefox/*.default/.parentlockĪfter you do so, try to run firefox one more time. Just run the following to delete the locks: Typically, these lock files are found in the browser home directory.

Here are some steps to use Firefox, if it becomes locked by mistake: Often times Linux users have multiple Firefox session running, each session use the same lock file which causes Firefox to get confused. ~/Library/Application Support/Firefox/Profiles/*.default/.parentlockīefore attempting the following steps, please make sure that you are currently logged into only one computer. You may also need to delete your parentlock file, located at: To fix this issue on OS X, please log out, and log back in. Properly (because of a crash or network interruption.) Occassion, Firefox will not start, because previous sessions were not closed Previous instances before trying to start a new browsing session. If your account is not local to your machine, you must close all That means that you can have only one open instance of the program The popular Firefox web Browser isn't written for concurrency within a user Troubleshooting Firefox on a Network Account

Firefox os x troubleshooting