Ubuntu & Firefox Resize Buttons
If you are facing the "loss of resize buttons" on FireFox 3.x on Ubuntu 8.x and here is the solution to fix this problem:
Go to System/Preferences/Appearance and select the "Visual Effects" tab. Then choose the option "None-Provides a Simple Desktop Environment with out any effects" and it will solve your problem.
I had this problem and the above solution fixed it. I also read about executing the following cmd in terminal window but never tried...
"metacity --replace" &
Hope this helps.