If I load (apparently) any plugins or attachments, specifically tabmix and/0r smoothwheel, Firefox will no longer "open new window".

This never happened for years, then for the past 6 months or so I ended up having to use other browsers because I could only use one Firefox window. Yesterday I uninstalled, redid profile and viola, firefox opens new windows, until I try to install tabmix and/or smoothwheel, then I am once again not able to get a new firefox window.

Does the issue still occur if you start Firefox in Safe Mode? http://support.mozilla.com/en-US/kb/Safe+Mode
What version of flash player do you have installed? http://www.adobe.com/software/flash/about/

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