Mozilla’s Firefox browser is my browser of choice for testing and developing web applications. The browser itself is not the thing, it’s the extensions that make it so choice for what I do. Just today I had to spoof a referrer header to test whether or not it would be validated by some code, and I found an extension called TamperData to do just that; so far, so good. Not including TamperData (which I assume will become essential over time), here are the extensions I use that I consider essential to my Firefox experience while testing and developing sites:
- User Agent Switcher: fantastic for pretending to be a phone
- Web Developer: lots of very useful page debugging stuff
- del.icio.us: sorry Furl, I’m just used to it
- Adblock Plus: killer
- TimeTracker: OMG, I just browsed for the past four hours! Thanks Lifehacker, now I can fully quantify my guilt.
- Google Browser Sync: helps me stay logged in between WinXP and Ubuntu. Google has all my secret-ist data now but: whatever.
- Extended Statusbar: coolio
- BugMeNot: like Adblock, for annoying sites that require “free” registration.




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