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Firefox is the most popular “alternative” web browser, that’s mostly because the most computers on the world use Internet Explorer – default web browser that comes with Windows operating system. Since Internet Explorer is drastically improved for the last two years, for me the best browser is still the Firefox. Of course, it’s completely free to download and use!
It’s one of the first Firefox extensions I install on my favorite web browser. Adds a lot of useful functions and information that can be useful for any web developer and designer. I absolutely recommend you to use this extension because it’s a very simple and yet very effective.

This is another very useful and simple Firefox extensions that I need to have installed on my system. Allows you to measure any element of the page using nice “ruler” effect. Extremely useful if you want to measure something quickly on your (or any other) sites just from your web browser.

Of course, webmaster and web developer work would be nothing without the File Transfer Protocol, popularly called FTP. This cute little extension actually provide you the basic-featured FTP client where you can upload and edit files on your website or a blog. One of the most quality extensions for sure.

HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing. The details of the errors are seen when looking the HTML source of the page. Extremely useful to find errors in your site source code.

This extension monitors and analyzes all incoming and outgoing HTTP traffic between the web browser and web servers. Allowing you to find out many useful information about specific requests, responses of your site header, sent or received cookies, post parameters and much much more.

Also Read: Top 5 Features of Firefox 3.5 and Top 10 Firefox 3.5 Features, You Probably don’t know
If you have any suggestions and question than feel free to ask me i will response you.
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Great mini post. Always a good reminder about the must have add-ons. Oh, btw, believe it or not Web Developer Toolbar already has a measuring ruler (Misc->Display Ruler), so no need to install MeasureIt.
thanks for your Idea but i found measureit best
Wow thanks for the list dude.. I use Fireshot…most useful plugin for blogger to take screenshots.
TechZoomIn´s last blog ..Tips To Maximize Your AdSense Income
nice post, u hev a great blog and thanks for the info
maseta´s last blog ..Wordpress Application for Blackberry
Thanks to Tech for this like of appreciation, keep reading
thanks also to maseta
Thanx for sharing this as i am FF lover and prefer to use Firefox as my default browser for surfing
Custom term paper´s last blog ..Un astudentessa racconta la propria preparazione agli esami universitari a Bari
thanks, keep reading
Yeah. Firefox is cool! And it helps a lot too!
Thanks for the information. I currently use FTP for all my jobs

BloggerDaily´s last blog ..Creating Poll for Your Blog
ftp is also decent file transfer utility, thanks for commenting
Nice post, thanks for sharing mk. Never thought of something like measurelt. Must take a look at it.
thanks Ben!, keep reading
Nice List. These are must add-ons. I was not aware about validator. Nice Info.
Ruchi´s last blog ..Shortcuts of Mozilla FireFox
thanks Ruchi for appreciating
Very Nice Piece of Information.
Keep Up The Good Work!
Chethan T´s last blog ..How I Answered to Google AdSense User Feedback Survey!
again thanks
Good list. I like all those extension. My fovourite is fireFTP =)
blinkky´s last blog ..Google Looks Like When Was In Beta
I am also using 3D FTP, its great
good stuff, it’s helpful
Boussacsou´s last blog ..facebook Icons in High Resolution for developers
thanks Boussacsou
actually, you *must* have web developer toolbar and firebug. someone still uses ftp?
ok Cents thanks for commenting
Addons are the big power of Firefox. But they made them heavy to load. One should have to compromise on this thing if he want to use a lot of addons.
Tahir Akram´s last blog ..How to remove WGA tray icon
thanks for commenting to Tahir Akram