Ok

a must have powerfull tool

Amazing extension and supports different user-agents across containers. Great add-on and one of the reasons why I still use firefox for work (Need to sometimes fake an IE-11 user-agent in order to make websites work)

Great, you should really advertise ability to use a different UA per container more, didn't find another addon that does that yet.

I had several websites such as Google Ads that said the latest version of Firefox wasn't supported. This extension allowed me to appear as a chrome user on Windows and eliminated that issue. This extension does exactly what it says and has a ton of options. Thanks Devs!!