I do not remember when, but I must have set a Master password on Firefox. I've tried all the possible passwords that I might have used, but nothing worked. Did reinstall the browser and still has all the data plus the Master password stored and asking for. I do not care if I loose the data stored, but I need to install a certificate and - no way - it wants a Master password for Firefox. I work on Mac OS X and I Do know the master pass of it and the one for that particular certificate. But not the one for Firefox - it turn out a big problem for me!!! Is there a way to disable it ?