Rated 4 out of 5 stars

Από τον/την avada στις Ιούλ. 19, 2012 · μόνιμος σύνδεσμος

This would be really could if the addon could browse useragentstring.com, to load UA strings from there. Because that site has up to date user agent strings.
Or an autoload a constantly updated xml list would be about as good too. But I don't know of any such lists...