Comment 124 for bug 93546

This may be foreign to home Windows users, but there's an awful lot of us using Windows in networked office environments, where our home drives are on network shares, and our profiles are roaming.

In this situation leaving yourself logged into your main PC with Firefox running, and then logging into another machine on the network (as the same user) and trying to open Firefox gives the same message ("Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.").

Please don't go down a Unix-only path for fixing this...