David R. Heffelfinger

It seems like every other day there is a link on DZone about someone listing their own favorite Firefox extensions.

Well, I didn't want to be left out, so here are mine:

1. Web Developer, provides a lot of functionality useful when developing web applications. One of my favorite features is the ability to outline elements on the page, very useful.

   

2. Firebug, I can't live without the ability to edit Javascript in real time, and see the results on the page immediately. Also, the Firebug console is invaluable when debugging Javascript, freeing us from the awful alerts(); we used to have to use all the time in the past. Working with Javascript without firebug is like working with a hand tied behind your back.
3. iMacros, when developing web applications, we often have to go through tedious, repetitive steps to get to the page we are developing. iMacro allows us to record macros to go through the repetitive boring stuff for us, a real time saver and sanity preserver.

There you have it. If you develop web applications for a living, the above Firefox addons will make your life a lot easier, and will also make you a lot more productive.