Review for User Agent Switcher by JustNick
Rated 5 out of 5 stars
Somehow I installed this on Firefox v9.0.1 and it works perfectly fine, helping me to download HDMOV movie trailers from apple.com. Doesn't slow the browser down, the button looks fine with my theme. Handy addon.
To create your own collections, you must have a Mozilla Add-ons account.