Here's a screenshot of the error. It's still doing it after I've updated to the newest version 7.0.1

Try a new window to see if that works better and close the current window.

You can also try http://kb.mozillazine.org/Corrupt_localstore.rdf

Tried opening a new window and the same thing occurs, content with no url. I also deleted the file shown in the link and it still happens.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

• https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

See also:

• http://kb.mozillazine.org/Resetting_preferences
• https://support.mozilla.com/kb/Resetting+preferences

After going through everything it looks like the culprit was Google Plus Manager 0.6.5. When that was disabled, whenever I opened a new window the error would occur. Thanks for the help.