i believe most problems would be eliminated if you totally removed the old FF 3.6.15 completely, when uninstalling it will ask you if you want to keep your personal setting say NO remove them. However before doing this Make and store a copy of all your bookmarks in a different location I.E. like a on a flash drive. You can then download FF4 and install this of course means you will have to again install all the extensions, plugins, and themes/persona again and tweak to like you had your previous 3.6.15 FF I had problems with FF4 when I updated over the old FF and I did the above and no longer have any problems., with FF 4
I just did it. Unistalled ff 3.6.xx and also 4.0. Result, the same but I narrowed down a bit. See below...
Try disabling "Use hardware acceleration when available" option under Tools>Options>Advance>General. There may be an incompatibility between your ATi display driver and the DirectX/2D/3D calls made to it from Firefox. When this option is enabled (it's enabled by default), Firefox attempts to utilize your graphics hardware to accelerate both content and compositing, including CSS styles modified by non-default themes.
It looks like you are running some sort of custom firefox theme there which is overlapping the titlebar area. If you reset it back to the default theme I imagine all will be well. Unfortunately FireFox4 has a number of quirks relating to space at the top of the window and the amount allocated will vary from skin to skin. This is something that is outside of our control. BTW your OS skin frames look like they are Windows Aero with WB too. Did you enable the option in WB to always use Aero frames?
No, I am using personas and this is apparently, the issue. With the default theme and no personas everything is fine, but as soon I apply any personas skin to FF the "problem" is there.
I had "corporate skin" and use the Vista-ize me option. Is there a problem with this?