Problem with firefox opening new windows

[Gordon Charrick <gordonmc cox net>]

Has anyone else seen this problem? I've got the latest firefox

Occasionally, if I left click on a link, instead of FF opening the link
in the current window, it will open a new window maybe 75% of the size
and open the link there. This window has no decoration other than a 
titlebar. The "main" FF window acts like a program that is hung somewhat.

The nasty thing is that if I click on the X in the upper right corner to 
close the new child window, it completely kills FF, even if there are 
several tabs open. I can generally refresh the page and the window goes 
away and open properly in the main window. It's really annoying and I 
can't reproduce it at will but it does happen often.

Gordon