FireFox

I would like to publicly profess my love to several Firefox extensions. They make my life as a web developer so much happier and easier, than I wonder how I ever trudged through web-developer-life without them.

• Web Developer - The absolute must-have extension for anyone who builds web sites, no matter how small or few and far between.
  
• MeasureIt - No more eyeballing pixel widths!
  
• ColorZilla - I shudder to think back on the huge PITA of getting hex codes for colors before this lovely extension... taking a screenshot, pasting it into Photoshop, using the eyedropper tool... how much time have I saved because of it? (Answer: lots.)
  
• FireBug - As mentioned on The Javascript Weblog; just darn useful.
  
• IE View - All the maddening bugs of IE without actually having to launch the browser. (With the caveat that it doesn't do me much good on my Mac at work, where I don't have IE/Mac installed.)
• Live HTTP Headers - Go along for the ride from user interface to server and back, making all local stops.
  
• EditCSS - Modify currently loaded stylesheets.
  
• Cookie Crumbler - Convenient way to quickly clear cookies from a domain.
  
• Clear Cache Button - Another small convenience that makes a big difference.

Feel free to share your own favorites. Spread the love!