I'm using FF 29.1 and am having a problem. When I close FF and want to open it later again about 75% of the time I'll get an error message. It says:
"FireFox is already running,but is not responding. t920-982-6312 new Window you must first close the existing Firefox process, or restart your system".
I then have to open Task Manager and end the process by hand. FF will then open properly. I started having this problem before updating to V29. I use Win 7.
Any suggestions will be appreciated. It's driving me crazy.