Unusable Rated 1 out of 5 stars

Description says, it should be easier than modify headers - i say it is unusable - I didn't get a simple modify of User-Agent working...

This review is for a previous version of the add-on (0.3.5.1-signed). 

you are probably looking 4 this https://addons.mozilla.org/en-US/firefox/addon/user-agent-switcher/