Safari lets me emulate other devices by entering in a user agent string, i.e. it can "look like" an ipad or android phone. Can Firefox do this - look like another device using user agent strings from that device?

I can use an user agent string from any device in Safari in order to have safari emulate that device. It's a very useful feature. My safari can act like an ipod, ipad, windows phone, android phone ( of any type ) etc. Great for testing mobile apps.

Can Firefox do this. I Do NOT want to run firefox on my phone. I want FF on my mac to LOOK LIKE a phone to the target site.