Review for User Agent Switcher by K S
Rated 5 out of 5 stars
Very good. Does exactly what it says.
MUCH BETTER when you install more agent options, available here:
http://techpatterns.com/forums/about304.html
or directly here:
http://techpatterns.com/downloads/download_item.php?folder=firefox&filename=useragentswitcher.xml
To create your own collections, you must have a Mozilla Add-ons account.