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Why does windows 7 show the equivalent of alt+tab when I press the tab button in firefox v.12 and how do I stop it?

Edit: Trying to change fields on gmail sign in. Unfortunately the behaviour isn't consisent. Sometimes it works normally (next field), sometimes it disappears to no-where and sometimes it acts as above. Also have trouble with Ctl+tab, and the windows key at times

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Does it only do this while in Firefox? Which version of FF? Does it do it while in Safe Mode? How about if you run FF with no add-ons? Did it always do this, or is this new? –  techie007 Aug 29 '12 at 15:23
To clarify @techie007's question, this is not normal behavior, so further details about what you're seeing and your exact configuration are helpful. –  Shinrai Aug 29 '12 at 15:41
Press each of the modifier keys (Ctrl, Alt, Shift) on both sides of the keyboard to make sure the system doesn't think they are stuck down or something. –  Darth Android Aug 29 '12 at 15:44
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up vote 1 down vote accepted

Try and use the same keyboard on some other machines. If the condition is reproducible, then there is definitely issue with your keyboard. Then I guess replacing it would solve your problem.

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