The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

1. Go to Firefox > Help > Troubleshooting Information.
2. Click the "Reset Firefox" button.
3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
4. Firefox will open with all factory defaults applied.

Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

Thank you so much. I had tried this before and it fixed the problem, and then I re-installed all my add ons that I had before. When I did this the same problem began to happen! So it was obviously one of the add-ons. I went through the restart FF process again and installed my add-ons one by one to see which one was causing the problem. I found that it was New Tab King causing this problem! I have had New Tab King for at least a month now and this never started happening until today... weird... but great to have it figured out! Thank you so much! Beware of New Tab King!

Hi - This is Eddie from NTK. We just released an updated version handling the new Firefox Beta - please grab it from https://addons.mozilla.org/en-us/firefox/addon/new-tab-king/versions/

Apologies for the bad experience. We're working hard to chase the never-ending Mozilla release train... --eddie

Eddie/NTK people - Thank you so much. I've had nothing but good experiences with New Tab King prior to this and I figured it was an issue with updates etc...

Thanks a bunch for the speedy reply and fix! I am back to using the new NTK :)

Glad this worked out. Feel free to contact us at [email protected] if you need anything. --eddie