Weird Firefox issue: New Windows for No Reason

I can't figure out if this is Windows 7 or Firefox 3.5

I don't notice it happening on my XP installation but it could just be coincidence.

Sometimes I'll be moving my mouse around kind of fast and click something and all the sudden my tab will disappear and open up in a new window. I can't figure out how I keep doing it and it's really annoying.

Never, for any reason, would I want a tab to become a new window without using the right-click menu. In fact I honestly can't think of any time, ever, that I wanted a separate window in Firefox. Is this something I can turn off in Firefox or Win7?

Something's wrong with my keyboard and occasionally my Shift and Enter keys stick; that could have something to do with it. (That's another weird issue; I've taken the keys out and cleaned them. They seem to stick from friction; not stickiness.)

This happens with my Firefox too. I'm puzzled, needless to say.

That's the draggable tag feature. You can drag a tab from the browser window into any place on your desktop and a new window will open for that tab. You can also drag it back into firefox if you didn't mean to do it. I bet there is a way to turn off draggable tabs.

Edit: Official feature is called tab tearing.

Edit 2: How to disable it
http://www.howtogeek.com/howto/2082/...aring-edition/

Ahhh thanks! That was it.

pparks, thou art a god.