If you are doing any mobile website development where you are using device detection or adaptive content, you know how unreasonable it is to use a mobile phone/device to test your site live. There are a few plugins that you can use with Firefox that allow you to basically emulate a live mobile device. These shouldn't be used in place of actual live device testing but for testing while developing, these have been invaluable to me.
Firefox Plugins:
- wmlbrowser - Add WML markup support to your browser.
- XHTML Mobile Profile - Add xHTML MP support to your browser.
- User Agent Switcher - Use this plugin to send the user-agent string of whichever mobile browser you want to emulate. Try a diverse range of user-agents to make sure your app can handle all the different formats.
- ModifyHeaders - Allows you to spoof headers. Use this to add an x-up-subno, x-wap-profile, etc. header to your browser session so your app thinks you are coming from a network operators proxy.
With these few Firefox plugins you can get close enough to looking like whichever mobile device you'd like without having to suffer the delay of testing with a real phone.