Works in Zen too! :)

Edit: No longer works anymore. Sites that block Firefox users are blocking them again even with this extension set to tell the site I'm on Chrome. :(
Needed to use a site that was silently refusing to let Firefox users log in. Used this extension to tell the site I'm on Chrome. I can log in now. 10/10 Would recommend if you find a site that hates Firefox, this works to bypass it

The only user agent switcher I've found that reliably works. Allows you to apply custom user agent to a specific domain. UI is simple and easy to understand.

The best user agent switcher. Buffering on Youtube magically gone. Compared to using FF by default that YT will buffer every 10 seconds.

very good at its purpose

Firefox on mobile doesn't have a feature to permanently keep "Desktop site" on, sometimes when the website is unloaded from memory and reloaded the website goes back to mobile view which can be frustrating. This extension is pretty much a fix to Firefox's lack of such feature.

Simply doesn't work on mail.com. That was exclusively what I needed it to do, so that's a total failure.

Works great to fix YouTube illegally slowing/breaking functionality on browsers other than Chrome. However, it completely breaks functionality in Google Docs, making it impossible to type in a document while the add-on is activated. As someone who does a lot of work in docs, this is a really significant issue, so a fix would be appreciated!

Aucun effet sur Firefox pour Android, testé sur Boursobank et Renault, le navigateur reste détecté comme un Android

Great add-on. You can apply user agent switches per domain. It worked at first try on YouTube. The icon colour will change accordingly whether there is a switch applied per domain or general. Way clearer than 'User-Agent Switcher and Manager' by Ray.