All we need is another 20+ Must have Firefox extensions

I get asked a lot which Firefox extensions I use. OK not really, but I just needed to keep them as a list, so I know what to install next time I have to work on a PC with only IE installed.

All we need is another "20+ Must have Firefox extensions list for the Web Developer". With Forecastfox making the list it cannot be too serious. Also are they still called extensions or Add-ons?

Name of Extension	Image	Why I use it
Adblock Plus		Yes I do block ads. There I said it. This was one of the extensions that first got me using firefox.
Adblock Plus: Element Hiding Helper		Lets me hide more. A companion extension for Adblock Plus
ColorfulTabs		I usually have open 10+ tabs in Firefox, so the Colour makes the Tabs a little easier to read.
ColorZilla		Gives me the colour RGB and HEX values.
del.icio.us buttons		I am now hooked on bookmarking and tags. This lets me to easily tag pages, and bookmark sites that I probably wont ever visit again.
Fasterfox		I don't use this as much as I used to, but the timer it has shows me how long the pages take to load.
Firebug		I don't leave home without this one. It is great for trouble shotting web site problems. This is usually always open on in my Dual Montior set up.
Font Finder		Used to help my identify which fonts a web site uses. very helpfull it it is hidden deep in the CSS.
Force Content Type		I use this when I want to view an XML file in the browser, but the site is sending me the wrong headers
Forecastfox		I like to know what the weather is outside. Sure I might not actually go outside, but its handy to know that Melbourne is Mostly Cloudy and 11 degrees.
Greasemonkey		I use this a for a couple of sites
Html Validator		Another one I don't leave home without this one. Although now I am getting to the point where Warnings are fine, its the red cross I need to worry about.
IE Tab		I have it, but don't use it. Generally I just open up IE itself. One of the advantages of a dual monitor set up.
Javascript Debugger		its makes debugging Javascript that little bit easier.
Live HTTP Headers		I need to see what HTTP headers are.
MeasureIt		Sure there is a Ruler in the web developer extension (Miscellaneous -> Display Ruler) But I like this one.
MinimizeToTray		I have it installed, but I use Power Menu now. So I guess I should really disable this one.
PDF Download		Because sometimes it is easier to download the PDF
Session Manager		In a perfect world I wouldn't need this, but on the odd occasion my brower does crash, this lets me resume where I left off.
Stylish		Great for testing out a style sheet, without actually uploading. Not used much recently, but was a great tool to move the Digg page around when the site changed layouts
Tab Mix Plus		Gives me a little more options for the Tabs.
User Agent Switcher		Yes I used this to make my browser look like the iPhone a couple months before it was released, and I hit all the Apple sites I could find. Sorry to all those who got excited when they saw (Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A537a Safari/418.4) in their logs. Now I use it to test out my mobile / wap pages.
Web Developer		This is the first extension I install. I mainly use the "Information -> View Color Information" on web sites to figure out what my homes paint colour scheme should be.
wmlbrowser		Lets me browse wml (Wap) sites in my browser. Really need to use this with User Agent Switcher for full effect.
XHTML Mobile Profile		Another tool to help test out Mobile Phone designed web sites.
YSlow		Great new tool from the folks at Yahoo. Used with Firebug. Not too sure if I like it yet, as it just means I know have proof my web sites are too slow, have too many javascript files and are sites get Ranked "F". It really should grade on the curve.

About the Author: I run the some small websites in my spare time. I started doing web development when geocities was cool, hotmail didn't belong to microsoft, having an ICQ number 3096077 was cool, and used Netscape Gold for its HTML editing capabilities.