Add-ons

Addons Manager Hilite by custom.firefox.lady

Remembers last selected (hilited) extension/theme/plugin/userstyle in Add-ons Manager. Version 3.0 also includes sorting buttons. Turn off/on the add-on selection list box and/or fine tune behavior via its Options.

Execute JS by Rudolf Noe

Execute JS is a enhanced JavaScript-Console, where you can comfortably enter and execute arbitrary JavaScript-Code and modify functions...

XML Digital Signature Tool by Subrata Mazumdar

XML Digital Signature Tool is a Firefox add-on for processing Digital Signature in XML documents
(Please read the installation instruction in the "Developer Comments" section before downloading)

Key Manager by Subrata Mazumdar

KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation

Markdown Viewer by Thiht

Markdown document viewer.
Allows to visualize formatted markdown documents in browser.

Extension Auto-Installer by Wladimir Palant

Important note: This extension will not work in Firefox 57 and above. Providing this functionality in Firefox is no longer possible, the extension is discontinued.

Developer Assistant by Ted Mielczarek, Gavin Sharp, others

A suite of tools for developers.

Controle de Scripts by Fernando Pereira Silveira

Controle de Scripts is an extension that allows you to control what JavaScripts do on your browser.

Extension Test by Kris Maglione

A simple add-on for extension testers, especially AMO editors and developers who plan to submit their add-ons to AMO.

GitHub Extension Installer by Diego Casorran

Install Browser Extensions straight from GitHub Repositories

TabSubmit by Kai Liu

Lets the user direct the submission of a form to a new tab or window. [Bug #17754]

Config Descriptions by Dave G

Shows source comments for advanced application preferences in about:config

Console² by Philip Chee, zeniko

Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.

Candy Canes and Gifts by MaDonna by MaDonna