


Solution #3 (Advanced)ĭelete the lock files that prevent Firefox from launching. Note that information sharing between profiles is limited, so your bookmarks and form data will not be available. If you'd like to choose your profile each time you start up Firefox, uncheck "Don't ask at startup." You can find more details in the Firefox's Managing Profiles page. Here you can create, rename, and delete Firefox profiles. On Linux machines, open a terminal and enter "firefox -P".On Windows machines, go to Start > Run, and type in "firefox -P".Use Firefox's profile management, to create a new profile and run many instances of Firefox simultaneously. This will resolve the problem in most cases. Solution #1 (Easy)Ĭlose the browser on the other machine. To solve this problem, one of three approaches can be taken: first, close the browser on the other machine second, create a new profile or third, clear out the lock files that prevent Firefox from opening.

The error will also appear if you try to run Firefox on both lab Windows machines and the Windows server. If you try to run Firefox in two places, such as a lab machine and a remote portal, you will receive this error. An instance of Firefox requires exclusive control over these profile resources across various machines. MSI systems share home directories across various machines. Firefox profiles are stored in the user's home directory.
