Try one of these articles:
- Refresh Firefox - reset add-ons and settings Restore Firefox to its default settings while saving essential data. This can fix slowness, crashing, search hijacking and other problems.
- Firefox Health Report - understand your browser performance Firefox Health Report lets you know how well your browser is performing and what steps you can take to improve it.
- 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.
- Connectivity or crashing issues after Firefox 43 update After the update to Firefox 43, users with ''Nvidia Forceware Network Access Manager'' might observe connectivity issues and crashing. See here how to fix.