Add-ons

DownThemAll! by Nils Maier, Federico Parodi, others

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

Element Hiding Helper for Adblock Plus by Felix Dahlke

Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.

QuickDrag by Stevie Smith

Extends the function of the drag-and-drop mouse gesture so that it can be used to load URLs, do a web search of selected text on a page, or save an image on a page. The successor to Super DragAndGo.

CustomizeGoogle by CustomizeGoogle

CustomizeGoogle enhances Google by adding information and removing unwanted information.

Collector's Note Since CustomizeGoogle seems to be an abandoned extension, I'm using OptimizeGoogle (http://tinyurl.com/ls279o) a community maintained extension based on the same source code of CG.

ViewAbout by Gary Kwong

Enables access to various about: dialogs from the View menu.

ImageTweak: zoom/rotate images and videos! by Carlo Alberto Ferraris

A no-clutter image viewer for Firefox that allows you to zoom, rotate and display images/videos against a custom background. ImageTweak is a must-have addon for any photographer or photography-loving user.

Extension List Dumper by Sogame

This extension adds a button ("Dump list") to the Add-ons window. When this button is pressed, a new window is opened with the list of installed extensions, themes or plugins...

BBCode by Jed Brown, mrtech

Adds BBCode, HTML, XHTML & Symbols formatting to the context menu for forums.