Very useful. Good to have. Only gripe is to add an option to change user agent every number of page changes. Like if that's set to 1, it will change the user agent every time a page is refreshed or a link is clicked. If set to 2, then after that happens twice user agent is switched. This, I think, would be a good addition to the random option.

nice agent switcher but it badly need a whitelist that set agent to default on selected website

Won't work with Gmail, just because of that I give it 4 stars.

it works, but..
does not override appVersion, and platform + oscpu are parsed incorrectly for 64bit OS (they are displayed as 32 bit/x86/i686 instead of x86_64, etc..)

ok

当指定一个网站的ua后。当访问这个网站时候自动切换到设定的ua，而不是去手动修改。谢谢

Best one I've used so far, but the interface becomes messy if I want to add a lot. Please, dev, find a way to add the entries I want, and to check the box if I want them to show, and when I want to. And a way to add easily common new user agent without searching for hours on the internet, and fix the icon, I don't know if it's possible to make it multi-process.

I've used it with the entries found on: www.techblog.willshouse.com/2012/01/03/most-common-user-agents and tested here: www.whatismybrowser.com and here: www.whoishostingthis.com/tools/user-agent