Add-ons

DownThemAll! by Nils Maier, Federico Parodi, others

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

Startpage HTTPS Privacy Search Engine by StartPage

Add Startpage - The World's Most Private Search Engine - to your search box. Startpage does not record your IP address. Search the Web in the best possible privacy!

FlashGot Mass Downloader by Giorgio Maone

Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.

Auto Resize Image by TrVTrV

Resizer for inline and attachment images (JPEG, PNG, BMP and GIF image formats).
All platforms are supported (Windows, Linux and Macintosh).

User Agent Switcher by chrispederick

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

SQLite Manager by lazierthanthou

Manage any SQLite database on your computer.

DuckDuckGo (HTTPS / SSL) by DuckDuckGo

DuckDuckGo is the search engine that doesn't track you. We also have smarter answers and less clutter. This extension adds DuckDuckGo (HTTPS / SSL version) to the search bar. For more features, see the DuckDuckGo Plus add-on. Enjoy!

MinimizeToTray revived by Nils Maier

Minimizes windows into the system tray.

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.

Ixquick (SSL) by SSL Search Bar

Ixquick is a search engine that does not collect or share personally identifiable information. This search bar add-on utilizes SSL to protect searches between You and Ixquick.

Live HTTP Headers by Daniel Savard, Nikolas Co

View HTTP headers of a page and while browsing.

Collector's Note 10of10. Your connection on the active tab is now kept alive ... alternatively can be used Dial Speed for "pinging" the inactive tabs, but Memory Fox and SaveMemory will suffer and a fragment of your total browser efficiency will be lost.

NoRedirect by Kai Liu

NoRedirect lets the user take control of HTTP redirects. It can be used to interdict an ISP's DNS search redirection hijacks, preview/screen "shortened" URLs (e.g., TinyURL), stop the annoying redirection of "smart" error pages, etc.

HttpFox by Martin Theimer

An HTTP analyzer addon for Firefox

UnMHT by arai_a

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

DownThemAll! AntiContainer by Nils Maier

Make the resources behind container pages easily downloadable by DownThemAll!