Firefox 'opens' but doesn't/won't open an actual browser window?

Firefox Beta 4 has crashed out on me several times, but since the most recent crash Firefox will 'open,' but doesn't actually open a new browser window. Even if I go to the menu and manually select "new window" it doesn't do so. Nor can I submit comments under the "Firefox Makes Me Happy/Sad because..." tabs. It's simply not opening new windows. When I go to the force-quit window, it doesn't show up as hanging, however. Two close outs of Firefox, and two restarts of the computer have not resolved the issue.
Most recent attempt to generate a new browser window generated the following error codes:
Error: no element found
Source File: https://testpilot.mozillalabs.com/testcases/index.json
Line: 1
Warning: Unknown property 'zoom'. Declaration dropped.
Source File: http://www.google.com/
Line: 6
Warning: Error in parsing value for 'filter'. Declaration dropped.
Source File: http://www.google.com/
Line: 6
Warning: Unknown property 'zoom'. Declaration dropped.
Source File: http://www.google.com/
Line: 0

Try running Firefox in [[Safe Mode]]. If it functions properly in that configuration, one of your add-ons is the culprit.

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