Automatically Redirecting on Page Load
Fragment of a discussion from Extension talk:Header Tabs
Okay - I would try switching to the "Vector" skin, and temporarily disabling those three extensions, and seeing if that fixes the problem. If so, then of course you should whittle it down to see where the exact source of the problem is. If not, then you could consider upgrading to MW 1.17 - Header Tabs uses different Javascript for MW 1.17 and higher. Actually, maybe it's worth doing that anyway - you'll presumably want to upgrade at some point, regardless...
