Rated 3 out of 5 stars

This addon should tell you what your current user agent string is.. secondly provide an option to set the default agent string so on startup its already modified to your chosen settings.. third option is set agent string for certain sites..so far you need separate extension (UAcontrol) for all those last two making this extension kinda pointless. It doesn't even come with an upto date agent string library or a link to easily fetch the maintained list.