Дополнения

User Agent Switcher от chrispederick

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Session Manager от Michael Kraft

Функциональный менеджер сессий. Сохраняет и восстанавливает состояние всех окон.

HttpFox от Martin Theimer

An HTTP analyzer addon for Firefox

AutoProxy от lovelywcm

Are you concerned about your privacy? Or, are you blocked from some websites by a firewall? And, are you arming yourself with a proxy? In that case, AutoProxy is designed for you! A tool to help you use your proxy automatically & efficiently.

Quick Locale Switcher от ppclick

Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.

Private Tab от Infocatcher

Добавляет приватные вкладки.

Mycroft Project от Mycroft Project

The Mycroft Project is a collection of OpenSearch & Sherlock Search Engine Plugins for your internet browser.

about:addons-memory от Nils Maier

Adds an about:addons-memory page that details add-on memory usage

Extension Auto-Installer от 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 от Ted Mielczarek, Gavin Sharp, другие

A suite of tools for developers.

Restartless Restart от 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.

XPCOMViewer от Ondřej Doněk

XPCOMViewer is tiny tool for exploring XPCOM components.

GitHub Extension Installer от Diego Casorran

Install Browser Extensions straight from GitHub Repositories

colour fox от r@hees

Moon In The Trees от Poppy