Rated 2 out of 5 stars

This would be ***perfect*** for what I need, but it does not resize accurately in Mac OS X 10.6.2. If I resize to 800x600 the resulting window is 808x580. Resizing to 1024x768 yields a window of 1032x748, so the addon is adding 8 pixels horizontally and subtracting 20 pixels vertically. I'm using Firefox 3.5.6.