I have Vista, running FF4. I clicked on a (trusted) link in an email (craigslist posting). It opened in FF4 but no tabs or anything else is showing. I right clicked everywhere, nothing. I tried f keys, alt, shift, etc, nothing. I clicked red x in upper right cornor and it warned me I would be closing 8 tabs. I cancelled. In the original window, every time I click on a link like this (I tried others) it just opens a new tab, showing a blank page. When I click the red x, the page content appears and it again says I am about to close 10 tabs. I then clicked on the defective window, clicked on the email link and in the defective window, it opened a new tab and is hiding the other 10. It will keep opening tabs and hiding all the others. I then opened another FF (from start menu) and it gave me a complete (all tabs) page. Clicking on the trusted link opens with no problem in a new tab in the new window. How do I restore the defective "window". I think this is a bug that needs to be addressed. Anyone else have this happen?