Add-ons

Saved Password Editor by Daniel Dawson

Adds the ability to create and edit entries in the password manager.

Password Exporter by Justin Scott (fligtar), Jorge Villalobos

This add-on allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

Note: This add-on won't work in Firefox 57. It may eventually if the APIs to access passwords are implemented.

Collector's Note Back up everything. Then hide the backup. Then back everything up again because you can't find it.

Session Manager by Michael Kraft

Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.

Collector's Note Even better than the session saver in Tab Mix Plus, which you should probably have as well.

DownThemAll! AntiContainer by Nils Maier

Make the resources behind container pages easily downloadable by DownThemAll!

Collector's Note For gluttonous leeching

Image Zoom by Jason Adams

Adds zoom and rotation functionality for images...

Collector's Note Zoom images with scroll wheel. Should be built in to Firefox. Maybe it is now, I haven't checked.

Toolbar Buttons by Button Guy

Adds toolbar buttons to the customize toolbar window in several programs including Firefox, Thunderbird and SeaMonkey. Some of the buttons make commonly preformed actions quicker, others add new functionality.

Collector's Note A bushel-barrelfull of buttons for Firefox, all the things you with there was a button for.

No More Install Delay by trlkly

UPDATE: XPI delay has been removed in Firefox 40!

Disable the install delay in Firefox. New 2.0 version now includes GreaseMonkey scripts!

Unlike similar addons, this works on Firefox 4 and beyond.

Collector's Note Firefox makes you wait 3 seconds before installing an extension. This here solution to that outrage could save you a good 60-70 seconds over the next few years.

Active Stop Button by Off JustOff

Stop gif animation with button, context menu or Esc key

Collector's Note Click once and it's a regular stop button, but click multiple times and it'll halt .gif animations, stop other tabs from loading, all the stuff you'd want a stop button to do if you're clicking it frantically

HashColouredTabs+ by John P Baker

Improves tab identification by providing a small colored icon for any site which doesn't have its own 'site icon'.
★ 'favicon' now also shown in history and bookmarks ★

Collector's Note Helps you keep track of icon-less tabs.