Seems a lot of people publish their list of most used Firefox add-ons. And since i get this questions regulary. I decided to make a list of the firefox add-ons i mostly use. Although some don’t have firefox 3 support yet. These tools have made life as a developer easier. And in some cases speed things up :)
This is one of those tools that are indispensable in every web developers toolkit. It’s a great tool for debugging interfaces. You can actively step through the DOM elements. It also allows for dynamically updating the CSS and HTML. But one of the greatest features for me is the displaying of asynchronous JavaScript calls. This makes debugging Ajax applications a lot easier.
This tool integrates nicely with firebug. It makes it possible to show PHP debug information on the firebug console. So the debug data doesn’t interfere with the page your working on. I have to admit. I don’t use it very often. But it’s still a great tool.
An extremely power full tool. That let’s you add scripts to automate tasks. Or to trigger certain attack vector’s :)
If you’re scared of malicious JavaScript or just want to block those annoying ads. Then this is a great tool.
Amazing tool from Yahoo. it let’s you analyze the page load process. It’s great to
track down problems with slow loading pages. Or just a tool to help with optimization.
A nice tool to track DOM events.
Want to know what the web server actually sends back? A great tool for analyzing web traffic.
Watch HTTP headers send between your browser and the web server.
A virtual ruler to use inside your browser. It’s always good to be able to visually measure something
Gives the ability to change HTTP headers
A nice tool for editing headers and post data. Great security tool for testing webapplications.
This is an awsome tool from the GNUcitizen project. It adds an active scripting envirement to the browsers. In which it is possible to script almost everything. From the current page to the browser chrome. This add-on acts as the base for other tools. For more information head over the GNUcitizen.
The toolbar that comes with Zend Studio or Zend Studio for Eclipse. It add some PHP IDE features to the browser. Like debugging and profiling. Just a shame that it’s a toolbar and not some status bar icon. The toolbar takes up a lot of space.
This tool adds some text transformation features to the right click menu. When enabled it’s possible to transform / encrypt text with the following encoding / encryption (L337, ROT13, BASE64, HEX, URL, BIN, DES, AES, Morse code)
Unicode Input Tool / Converter
Conver hexidecimal || decimal entities or characters to unicode.



Thijs Lensselink is a PHP developer, consultant and all out open source enthusiast.
He has over 12+ years of experience in building and maintaining web applications mostly
on linux/Unix/BSD platforms. Besides a full time job he does freelance work with his ...
The Firefox/IE tab extension is a great tool for quickly swapping between Firefox and IE (in case you hadn’t guessed!) without having to load up 2 browsers:
https://addons.mozilla.org/en-US/firefox/addon/1419
Richard
30 Jun 08 at 10:21
I could not function without ScribeFire. Post to your blog without ever leaving Firefox. Next to Firebug my favourite FF addon.
http://www.scribefire.com/
Stefan
30 Jun 08 at 15:15
@Richard
I had this on my list of add-ons. And decided to leave it out because at home i mostly use *nix based systems. So no IE there. At work i used IE Tab for a while. But lately IETester and Firefox are doing the job for me. Maybe i need to create a must have list of add-ons. IE Tab will for sure be on there (on windows that is :)).
Thijs Lensselink
30 Jun 08 at 15:29
@Stefan
Great find. Another entry for my list of add-ons.
Trying it out right now.
Thijs Lensselink
30 Jun 08 at 15:48