By child windows, I'm referring to the options(/preferences) dialog, download prompt, XMarks sync. Anything that isn't a browser window, really.
A fresh install of firefox seems to align child windows in the centre of the window. After moving one of these windows, future windows will appear in the same location. Worse yet, if such a window appears whilst the browser is minimised, it starts appearing in the top-left of the screen.
I've also had an issue where the windows have appeared off-screen, whereby I had to use Alt + Space to move the window back to the screen.
How do I tell Firefox to place these windows according to its own rules again?
I plan to make a new profile once 4.0 is stable, but I haven't been able to find an answer otherwise. It's far too time-consuming to setup a new profile just to fix a window-location issue.