This extension is a good UA switcher. It lacks the option to explicitly choose a UA, though, as you always need to play in a roulette and wait for the needed one to appear. Would be much better if you can follow the same approach as "User Agent Switcher and Manager" on Chrome, which allows you to choose OS, browser and version.

This extension is a good UA switcher. It lacks the option to explicitly choose a UA, though, as you always need to play in a roulette and wait for the needed one to appear. Would be much better if you can follow the same approach as "User Agent Switcher and Manager" on Chrome, which allows you to choose OS, browser and version.