Great for Web-Dev. It even looks great but it could be more user friendly.

android,pls.

Doesn't work with Yandex Mail. - Kicks out from account after 15 minutes

this one causes audio glitches while watching video on various websites

The Best.

This add-on is so cool. You can go to a website and fool it into thinking you are using a completely different operating system than you really are.

It does the job, but it doesn't seems to get the silverlight that has installed on the system, somehow it can't use that and referring to the window where it's need to installed again.