Add-ons

DownThemAll! by Nils Maier, Federico Parodi, others

The first and only download manager/accelerator built inside Firefox!

Collector's Note Very nice, easy, fast, and unobtrusive add-on that lets you download all files of a certain type to a certain save location, lets you use builtin filters or configure your own using basic REGEX. Very helpful.

Live HTTP Headers by Daniel Savard, Nikolas Co

View HTTP headers of a page and while browsing.

Collector's Note Very helpful for those that don't have and use wireshark.

Font Finder by Ben Dodson, Eric Caron, others

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

Collector's Note Locate the fonts that are in use on a webpage. Small and unobtrusive.

Cookie Exporter by fliwatüt

Exports all cookies in IE manner.
Makes a Netscape standard cookies.txt file.
Very useful for WGET --load-cookies option.

Restartless Restart by Erik Vold

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Collector's Note Easily restart firefox, saving your session

Advanced Dork: by C-P

Advanced Dork: gives quick access to Google's Advanced Operators directly from the context menu...

Collector's Note Very unobtrusively makes the advanced google search operators available.