Firefox 4 fancy window border issue

The long awaited release of Firefox 4 is behind us. It’s faster, slicker and by all means just better than his predecestor. But, just after installing it a week ago, something was bothering me. It took me couple of days to figure out what it was.

The new fancy windows7/vista style window border introduced in Firefox 4 has a nasty habbit of “jumping” (resizing) when status bar appears. Status bar appears every time you hover a link, which basically happens all the time.

Check left and right window gradients while I’m hovering the links:

[youtube]http://www.youtube.com/watch?v=7p-Aa2ACRhM&feature=player_embedded[/youtube]

Oddly enough, this does not happen if browser is in fullscreen, maximized or very small:

[youtube]http://www.youtube.com/watch?v=1FZq34paxWc&feature=player_embedded[/youtube]

update 30.3.2011. Bug ID 633282.