Rated 3 out of 5 stars
Looks good, but two (minor) features missing -
Can the list include options for "Firefox" user agents (eg different version?)
Can the add-on allow "customise the list" option (so you can enter multiple custom agents for choosing; right now you must enter each time "new")
This would be very good.
I try to add only the main User-Agents to keep it simple, as you can see only Internet Explorer has different versions.
I could even add a long list of User-Agents, but it really would be used?
(Ohh! You reminded me to add Firefox Mobile in the list :D)
A "customize the list" is a really good idea and I think it would help anyone in need of other User-Agents (as in his earlier suggestion). I will arrange something for next update.
Thanks for the review!