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My Firefox 3.6.3 started displaying weird error messages when I load pretty much every page (a few per page):

ActiveX Error
Could not create the control {00000000-0000-0000-0000-000000000000}. Check that it has been installed on your computer and that this page correctly references it.

Any ideas how can I locate which plugin, add-on etc. is causing this?

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Disable all add-ons and one by one start reactivating them... Once you get the error again, you know that last one you reactivated is the culprit.

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Didn't help :(. Does it mean its a problem with one of the plugins? – Grzenio May 27 '10 at 14:19
If all the add-ons are disabled and your browser still displays errors, it means it's not an add-on issue. Try removing Firefox and re-installing it. – BloodPhilia May 27 '10 at 17:39

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