JavaScript error - TypeError: dom.location is null

On loading a screen in FireFox, I'll often get an error message with the heading [JavaScript Application] with the body reading "TypeError: dom.location is null"
I hit the "OK" button and everything seems to work fine, it's just an annoying tick.
I've reinstalled JavaScript for FireFox, but nothing changed.

joreill2Asked:
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jazzIIIloveCommented:
Hi there;

Please open mozilla in safe mode and observe the reaction:

http://support.mozilla.com/en-US/kb/Safe+Mode#How_to_start_Firefox_in_Safe_Mode

Any addon you installed nowadays? If so, what about removing?

Best regards...
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joreill2Author Commented:
It hasn't recurred, so I guess that's it
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