Here are 21 Firefox add-ons that can are essential for web developers, web designers, SEOs, and anyone else who wants to enhance their browsing experience and boost productivity. Also see the followup post Another 21 Firefox Add-Ons to Make You a Power User.

	Adsense Notifier I’ve become such a fan of this add-on. See your adsense clicks and revenue in the status bar or your browser window. You can change the refresh rate to get the last figures. The prevents me from logging into the Adsense reports page ten times a day. developer home download it!
	Adsense Preview See what Google Adsense ads would show up on the page. Choose from a drop list of the contextual sizes and a pop-up window shows the ad block. developer home download it!
	ChatZilla Easy to use IRC client that runs outside of the browser. I prefer this application over mIRC and Trillian. developer home download it!
	ColorZilla What color is that on the page? Now you can see the hex and RGB of colors with an eyedropper that save the color to the clipboard. Great for web designers. developer home download it!
	del.icio.us Bookmarks Tag and save web pages to your del.icio.us account. developer home download it!
	FireFTP I just found this one. It’s a FTP client in a browser window. This a great for moving a files to and from servers without firing up any applications. developer home download it!
	ForecastFox Get the temperature, conditions and forecast on your browser. Also, mouse-over an image and see the live doppler of precipitation. This is handy for showing an alert in severe weather conditions. developer home download it!
	Google Browser Sync An add-on from Google to sync bookmarks, history, persistent cookies, and saved passwords across your computers. I use this to keep my bookmarks in sync on my PC and Mac. developer home download it!
	Google Notebook This add-on sits in the status bar and allows you to highlight text and save it to your notebook. You can also bookmark pages. A great way to write down inspiration as it hits you while your browsing. developer home download it!
	Google Toolbar This goes without saying. Just get it. developer home download it!
	Greasemonkey Great add-on that allows you to see web pages the way you want to. There are hundreds of pre-made scripts ready to go to be used in popular web applications. I use one that numbers the results in Google as well as thumbnail next to the web page. developer home download it!
	HTML Validator Essential for web designers! Now you can see the number of HTML validation errors and warnings in the status bar. Also, you can see what line the errors occur on in source view. developer home download it!
	InFormEnter Handy add-on that allows you to save form data and right-click to fill in forms. This works great for submitting your site to web directories. developer home download it!
	Live HTTP Headers Opens a another window that display the HTTP headers as you browser through pages. developer home download it!
	MeasureIt Get the height and width in pixels of anything on a web page. This handy add-on is essential for web designers and developers alike. developer home download it!
	MediaWrap Wrap ActiveX into the Plugins which supported by FireFox. You can just link the media files (WM player, RM player, QT Player and Flash player) as normally without security problems. developer home download it!
	Mouse Gestures Navigate the browser by moving your mouse. Go back a page by holding the right mouse button and dragging to the right, or open a new tab by right-clicking and dragging up. You can customize the gestures to your liking. developer home download it!
	ScribeFire A newer plugin that integrates with popular blogging applications like WordPress , TypePad and others. When the icon is clicked, these is a split window of hald browser of the page you are on, and have form to post directly to your blog. I highly recommend this addon. developer home download it!
	SEO for Firefox Get extensive information about web pages that return in Google search result page. Discover Page Rank, age, Alexa Rating, Del.cio.us, and 12 other sources of data. developer home download it!
	StumbleUpon Toolbar Phenomenal toolbar which allows you to “thumb up” or “thumb down”, tag, and send web pages to your friends. Stumble random pages within your area of interest. developer home download it!

Don’t have FireFox yet? Get it here.

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