Firefox

Extensions

GitHub uMatrix filters net requests.

GitHub uBlocko is a general-purpose blocker.

GitHub CanvasBlocker blocks canvas-API to prevent canvas fingerprinting.

AMO Clean Links converts obfuscated/nested links to genuine/normal plain clean links GitHub Source

AMO CSS Exfil Protection sanitizes and blocks any CSS rules which may be designed to steal data GitHub Source

GitLab Decentraleyes - local emulation of Content Delivery Networks (CDN).

AMO Privacy Possum wrenches common commercial tracking methods by reducing and falsifying the data gathered by tracking companies GitHub Source

AMO Print Edit WE helps to choose the contents of a web page prior to printing.

AMO Zoom Page WE zooms web pages either per-site or per-tab.

AMO Bookmark search plus 2 displays and filters bookmarks on search string, show parent folders GitHub Source

AMO Dark Mode is a dark theme for the web.

AMO Markdown Viewer Webext is Markdown (.md) file viewer. GitHub Source, Note for Linux users

AMO Fennec TextWrap adds textwrap to Firefox on Android. GitHub Source

Extensions · ghacksuserjs/ghacks-user.js Wiki · GitHub

Configuration

The large number of browser settings can be configured via user.js. Create your user.js somewhere and drop it into your Profile directory.

Comprehensive user.js template for configuring and hardening Firefox - ghacksuserjs

user.js - Firefox configuration hardening - pyllyukko

Descriptions of some Firefox settings - DonQuixoteI

Firefox Configuration Guide for Privacy Freaks and Performance Buffs - 12bytes.org

Privacy-Handbuch - privacy-handbuch.de (in German)

Firefox Tuning zur Absicherung und Anonymisierung - kairaven.de (in German)

A brief guide to Mozilla preferences - MDN

Locking preferences - MozillaZine

Release/Build/Source

Firefox Releases: Desktop, Mobile

Release Calendar

Mercurial/releases/mozilla-beta/tags

Nightly Firefox source code search tool (DXR)

Forums

mozillaZine Forums

Firefox Builds - mozillaZine Forums