Sometimes Firefox creates two tab but asked to create a new tab. However, FF handles them as one - if you colse one of the two tabs both are closed. I think this also applies to windows, i.e., if I create a new window FF actually creates two windows. This behaviour has been there several version, from 0.7-0.8 or so up to and including 1.0. I will add more details next time it happens - however, I don't think this has something do to with a certain URL, rather it seems as FF gets stuck in some weird state.
Use any extensions? TBE?
Not TBE I usually have Web Developer, Reload Every and User Agent Switcher installed.
This seems to be a duplicate of #274303, no?
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Jason Levine is right, it is a duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=274303
Just curious, why was this marked as duplicate of https://bugzilla.mozilla.org/show_bug.cgi?id=191000 ? *** This bug has been marked as a duplicate of 274303 ***