Click it to bring up the selection menu, and choose the one you want.

Just click the sliders icon in the upper left (settings) and then down a little ways you should find an option called User Agents. Once installed, you don't even need to restart Firefox. Steps to reproduce Open about:config Create key with custom string as value Expected behavior user-agent header could be changed. It should be the first one that comes up. Now click on the puzzle piece in the top right (plug-ins and extensions), then click the Get Add-ons input field and type in 'phony'. Click on the gear/cog at the bottom right to open up settings. Once downloaded and installed, open Firefox and swipe to the left to bring the right side-bar into view. Once there, click the search icon (magnifying glass) and search for 'firefox'.

Go into your Applications menu and find Play Shop (used to be called Android Market). The first thing you want to do is download Firefox from the Google Play Shop.

I use Firefox with the desktop user agent spoof, which allows me to browse sites as if I were on a desktop PC. The Phony plug-in interfaces directly with Firefox's settings panel, and gives a convenient drop-down list for user agents (so you don't have to know the actual user agent string). This allows you to make websites think you're browsing on a desktop computer, iPhone, or something else. You can spoof the user agent on your Android phone fairly easily, using Firefox and the Phony plug-in.

Firefox mobile user agent