Firefox 4 on mac 'snow leopard' (10.6.7) won't open new windows - only tabs

I upgraded a couple days ago, and just noticed that I cannot open a 'new' window, only tabs in the original window that opens when I initially click the FF icon. I've tried both command-N and clicking file/new window from the menu. If I right-click a tab and select 'move to new window' the tab just goes away - no new window appears. New tabs open without an issue. I've rebooted, but it doesn't help.
I'm running macbook pro 13", 8g ram/1t drive - shouldn't be resource starved. Doesn't appear to matter what else (if anything) is running. The only plug-in I've installed is Adblock.
My previous installation (3.something - was current) 'lost' all my plugins somehow - they showed in the list, but wouldn't run; I removed them all but it wouldn't let me re-install any (I forget the error). That seemed to all get fixed when I upgraded to 4; adblock installed and runs like normal. Not sure if there is any relation, but thought I'd mention it.
Thoughts?

I have this same problem. Firefox 4 on 10.6.7 on a 2009 unibody Macbook Pro.
I've noticed that I only have the problem when I'm using multiple monitors and my Firefox 4 window is to the left of the Mac OS X Menu Bar.
My typical arrangement is: laptop monitor with firefox 4 window TO THE LEFT OF external Dell 24 inch monitor with Mac OS X Menu bar.
Moving my Firefox 4 window to the external monitor allows me to open a window.

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<blockquote>Locking duplicate thread. 
Please continue here: [/questions/832115]</blockquote> 
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Firefox 4 on mac 'snow leopard' (10.6.7) won't open new windows - only tabs

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