Essential Firefox Add-Ons
Firefox, Web Development June 28th, 2007
Oh Firefox, how I love thee. If only you launched a little faster on OS X. But I can’t quit you. Why? Add-ons!
del.icio.us Bookmarks - tag your bookmarks, access them anywhere, share with your friends.
Firebug - indispensable inline DOM visualization, and much more.
Web Developer - a ton of handy page hacking tools.
Aardvark - quickly clean a page up before printing
DownThemAll! - download accelerator and easily fetch all embedded links of a given file type in one go.
Fasterfox - page render time, network speed tweaks, and pre-fetching.
iMacros - page scripting, automation, testing, etc.
Hi I'm Chris, a software consultant specializing in web application development and internet industry startups. This site is for my company Chris Degiere & Associates, Inc. 
March 19th, 2008 at 3:07 AM
My new favorite: Copy All Urls
https://addons.mozilla.org/en-US/firefox/addon/934
Great for opening some tabs and copying the titles and urls to send in an email or text file!
May 10th, 2008 at 11:34 AM
[...] attend. Technical sessions are also available online for free as pdfs. Reference my previous post Essential Firefox Add-Ons for a quick way to download all the pdfs in one click using DownThemAll! and Firefox on this link [...]
May 16th, 2008 at 9:19 AM
Also YSlow is a great performance review tool for optimizing your website or web application:
https://addons.mozilla.org/en-US/firefox/addon/5369