In the past few weeks when I viewed POTN with Firefox (I'm using Windows 7), I experienced a lot of trouble. It hangs every now and then, for about 10 seconds. A moment ago I removed my profile in Firefox and tried to disable my usual add-ons one by one - I disabled one and then browsed POTN for a few minutes.
The hanging occurred when FastestFox was enabled and it didn't when FastestFox was disabled. It seems that the suspect is FastestFox. Yet the above test may not be reliable, as I was too impatient to test for longer times. I really can't put up with the hangings anymore. 
Currently I disable FastestFox, and let's see how long it takes for another hanging. I'm wondering if other users have similar issues. Any suggestions and solutions are welcome!
If it means anything, here are my usual add-ons:
Adobe Acrobat
Download Statusbar
FastestFox
Fission
Garmin Communicator
Xmarks
Java

