When using OSX (10.3, all versions), Firefox (and, additionally, other versions of Mozilla) have a misbehaviour when dealing with "secondary" monitors. As a laptop user, who uses his laptop sometimes as a desktop, I frequently hook, and unhook, another monitor to the machine. This seems to cause some problems with Firefox (and Mozilla). If the mozilla/firefox window is moved to the secondary display, "overlay" boxes, such as the history pull down in the url bar and alt-tag popups on images and such appear on the primary display. I've seen this on all versions of firefox/mozilla builds -- from way back in the day, just finally gotten around to reporting it. (I'm a big slacker) This sort of behavior also happens with thunderbird, as well. How to replicate: Start application in a "single monitor" configuration. Plug in the secondary screen. Drag application to secondary screen. Use one of the "affected" features. (e.g., url-bar history browser 'zilla or firefox, View: quick-search pulldown thing in thunderbird ), and it should appear on the "primary" monitor, and not the "secondary". Enjoy ;) -rob

*** This bug has been marked as a duplicate of 245418 ***

This was not fixed by bug 245418 and now is being tracked by bug 314279.

*** This bug has been marked as a duplicate of 314279 ***