Review for User Agent Switcher by Mele20
Rated 5 out of 5 stars
This is a great extension and very useful. However, it does not work with SeaMonkey 2.6. I delayed updating SeaMonkey when it told me that this extension would be disabled if I updated from 2.5 to 2.6.
To create your own collections, you must have a Mozilla Add-ons account.