TexasCHLforum.com

Try this maybe:

To block pop-ups from plugins, open your Firefox 1.0 or 1.0.1 browser, type about:config in the address field. Right-click in the resulting config page somewhere and select New -> Interger. Type privacy.popups.disable_from_plugins in the resulting dialog, hit OK, type 2 in the next dialog and you're all set.

This pref can actually take three values:

* 0: open allowed
* 1: the opened windows are treated as popups, but they're allowed to open (we limit the number of these types of popups)
* 2: the window is a popup, block it


Might break some sites you need though. If so, just delete the key you created in about:config.