• about:config
• userChrome.css
• userChrome.js
• user.js
• themes
• tutorials and documentations
• extensions
  • general
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r/firefox/wiki/aboutconfig - Advanced settings tweaking subreddit

about:config entries - reference to the entries in about:config

Privacy Related Tweaks - Collection of privacy-related tweaks thats shows you how to enhance the privacy of browser

overview of about:config - security and privacy preferences

mozillazine.org - Security and privacy-related preferences.

r/firefox/wiki/userchrome - Customizing the Firefox UI with CSS

Aris-t2/CustomCSSforFx - custom CSS tweaks for Firefox Quantum

Classic CSS tweaks - A lot of excellent information regarding userChrome.css

Timvde/UserChrome-Tweaks - a community maintained repository of userChrome.css tweaks

stonecrusher/simpleMenuWizard - Hide contextmenu items in Firefox

Photon Design System - Guidelines, reusable UI components, templates, and other resources.

• Firefox Colors Pallete
• Icons Library

Surfingkeys - Map your keys for web surfing, expand your browser with javascript and keyboard

Tampermonkey - Tampermonkey is the world's most popular userscript manager

Simple Translate - Quickly translate selected text on web page

settings

Web page

key	value
Automatically switch to the second language	true

General

key	value
Target language	russian
Secong language	english
Show translation candidates	false

Translation button

key	value
Display position - Direction	Bottom
Display position - Offset	20

Translation panel

key	value
Width	480px
Height	320px
Font size	14px
Display position - Reference point	Clicked Point
Display position - Direction	Bottom
Display position - Offset	20
Font color of translation result	#bdbdbd rgb(189, 189, 189)
Font color of translation candidates	#e3ded5 rgb(227, 222, 213)
Background-color	#333333 rgb(51, 51, 51)

Preview

Adguard AdBlocker - Unmatched adblock extension against advertising and pop-ups

SponsorBlock - Skip YouTube video sponsors

NelliTab - Highly customizable new tab 🦊

Auto Tab Discard - Use native tab discard method to automatically reduce memory usage of inactive tabs

### Discarding options
| **key**                     | **value**          |
|-----------------------------|--------------------|
| discard after               | 600ms              |
| when number of tabs exceeds | 3                  |
| display in context menu     | false              |
| do not discard when offline | true               |
| toolbar click action        | discard other tabs |
----

Tree Style Tab - Tree Style Tab, Show tabs like a tree.

Tab Session Manager - Save and restore the state of windows and tabs

Tiled Tab Groups - Provides tab groups / panorama functionality using the tab hide api.

Tab Suspender - Native, lightweight and performant open source extension that reduce Firefox's memory usage

Multi-Account Containers - Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy

Focus On Left Tab After Closing - Activate the left tab when a current tab is closed.