Review for User Agent Switcher by jarksville
Rated 5 out of 5 stars
Best of class add-on. Clean, simple, and gets the job done. Also, to those complaining, the user agent list SHOULD be short and limited to the most commonly used agents. The more people spoofing the same browser that you are spoofing, the better your anonymity.
To create your own collections, you must have a Mozilla Add-ons account.