How to deal with "TypeError: Components.classes[cid] is undefined". Seems to affect the

When starting FIREFOX 4.0, before actual appearance on screen a small error sign shows, apparently relating to a JavaScript problem, reading: TypeError: Components.classes[cid] is undefined. So far I figured out that it affects the bar where the internet address is typed in; it does not work on 'enter' command but will do when the arrow on the right of the bar is engaged by cursor and left mouse click.
Hope you can understand what I mean, if not please do not hesitate to contact me.

In my case I found this to be associated with a third-party extension, disabling the extension disabled the functionality. Try running the browser in safe-modem turning off all extensions and defaulting the browser to initial install state, then enable each extension one at a time, starting with the firefox supported extensions until you find the culpritt

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