Comment 163 for bug 226470

I used to get this kind of behaviour before Firefox 3, where occasionally I'd get a tab's frame open in a separate top-level window (with no window title, and strangely isn't focussable -- using Sawfish as my window manager). Since Firefox 3 I don't get this as much, but I have noticed it happening with Flash sometimes. I have the FlashBlock extension running. Sometimes the new top-level window has the Flash object running in it (despite the fact that the replacement graphic in the main page's window is showing), and sometimes it is an empty, grey window. Sorry I haven't got any more useful information to provide.