I have had this problem since installing WB6, and i think it was happening in wb5 aswell.
My Titlebar and all edges of the window around Firefox are completely transparent... Heres a Screenshot to illustrate my meaning.

It is particularly annoying when trying to minimize/maximize or close firefox. Since as you can see, the buttons are in visible, forcing me to guess where they are and usually missing. Now i have to right click on the bar and hit what i want, which is annoying. This happens with every skin i try, ones made for wb5 and wb6, for vista and xp. I know Firefox and WB dont get along together too well. I have heard of WB not skinning firefox at all, leaving it normal, but i have never heard of it making it completely invisible. I'm just wondering if anyone else has had this particular problem and if they found a work around. Or will i just have to add firefox to WB's exclude list? It's a shame because i do hate vista and xp so. Since i have a dual boot. They run ok (That being an overstatement) but they're so damn ugly. Xp didnt try at all, and vista tried way too hard.
Any help i can get on the matter is greatly appreciated.