During the last year i expanded my plugin usage in Firefox. Some of them being really useful and some of them… well… was not even worth the time spent on installing them.
Here is my hot pick from 2009
This one is for those people who cant get their head around the classic cURL. The fact remains that there are still people who are into development/testing and doesn’t know about cURL and i’m not talking about newbies. So here is one tool that can save your day. Do any HTTP related work with this and i bet you will fall in love with this.

This lets you mess with the HTTP headers and parameters. But the best use of this i have found so far was that it can display the headers in a very neat way, that can be understood easily
This is a form recovery tool. I bet everyone of us has that frustrating moment after filling a form and submitting it, the data is all lost due to some insane wizardry behind the scene that we didn’t know about. Well not anymore. Lazarus helps to recover the form data that was entered and saves the frustration.
Well do i need to describe what this is? In short this can run selected SQL Injection attacks on the fields on a webpage. Great tool identify similar vulnerabilities.
and last but one of my favorite -
Anyone who has worked on regex knows that, it would be great if they could see the regex in action on the test data, on the fly, as they are building it. This plugin is a dream come true.
Trust me you need this plugin.
For the layman, you dont need any of these plugins. But i assure you that the following is a must have for both geeks and non-geeks alike.
For the geeks and the web-developers here is my list –