Try one of these articles:
- Refresh Firefox - reset add-ons and settings Repair or tune up Firefox by restoring it to default settings while saving essential data. This can fix slowness, crashing, search hijacking and other problems.
- What do the SSLv3 error messages mean on Firefox? When accessing a site with SSLv3, Firefox will block it and display an "Unable to connect securely" message.
- Firefox release notes - What's New and Known Issues A summary of new features and known issues in the latest version of Firefox.
- Reset your Master Password if you've forgotten it You can reset your Firefox master password if you've forgotten it, however, this will remove all of your saved usernames and passwords. Learn how to do it.