• user.js
• chrome
• Apply Configuration
• Update
• Potential Problems
• Must-have Addons
• References

The Firefox user.js file stores user settings. This a convenient way to save your browser customizations and apply them on different machines. All settings are based on arkenfox/user.js by default and override settings for sites to normal work.

• Disabled Firefox Accounts & Sync, built-in extensions
• Basically settings for security and usable in daily use
• Allow cross-logins, basic cookie policy
• Enabled saving session, keep logins and site data
• Disabled unused Web APIs and preset for permissions
• UI/UX settings
• Locale settings
• New Tab page, tabs, findbar, bookmarks configuration

Firefox supports advanced customization of its UI with user-defined CSS. A userChrome.css file affects the browser's UI, and userContent.css file affects the browser's content, which is all Firefox-specific pages (about:).

• Added icon for sound-playing tab (animated)
• Hide unused buttons from Tabs and Toolbars
• Hide search engines from the search/url bar
• Reduce space for tabs
• Show tab close button on hover

• Theme-based styles for Newtab page
• Multi-column for Addons page

Better choice - apply script with an empty profile. The script generates a new user.js configuration file with custom settings and overrides the user.js file and chrome directory (if they were) into Firefox profile. The file is loaded each time Firefox starts.

You can also change the values or add new ones on configuration files into the user.js-overrides directory or added your configuration js-file. Merging files in alphabetical order by default.

🛑 Backup your profile and close Firefox before running the script!

1. Clone repo:

git clone git@github.com:denis-g/firefox-settings.git
cd firefox-settings

2. Set your Firefox profile path on FIREFOX_PROFILE variable inside config.ini file.

# macOS
# FIREFOX_PROFILE="/Users/denis-g/Library/Application Support/Firefox/Profiles/XXXXXXXX.profile_name"
# Linux
# FIREFOX_PROFILE="/home/denis-g/.mozilla/firefox/XXXXXXXX.profile_name"
FIREFOX_PROFILE="/Users/denis-g/Library/Application Support/Firefox/Profiles/dfk39fj39.default-nightly"

3. ...and run main script:

sh setup.sh

1. Use Git as above, download zip-archive, or execute commands on PowerShell:

# download this repo
Invoke-WebRequest "https://github.com/denis-g/firefox-user.js/archive/refs/heads/master.zip" -OutFile "$HOME\Downloads\firefox-settings.zip"
Expand-Archive "$HOME\Downloads\firefox-settings.zip" -DestinationPath "$HOME\Downloads\" -Force
# open directory
explorer "$HOME\Downloads\firefox-settings-master"

This will upload repo into your Downloads\firefox-settings-master directory.

2. Set your Firefox profile path on FIREFOX_PROFILE variable inside config.ini file.

# Windows
# FIREFOX_PROFILE="C:\Users\denis-g\AppData\Roaming\Mozilla\Firefox\Profiles\XXXXXXXX.profile_name"
FIREFOX_PROFILE="C:\Users\denis-g\AppData\Roaming\Mozilla\Firefox\Profiles\dfk39fj39.default-nightly"

3. ...and run main script setup.bat.

• Close Firefox
• Execute setup.sh or setup.bat script, like as above
• Run Firefox
• On about:config page execute the cleanup script

• By default push and web notifications is disabled - site can't send desktop notifications for Firefox.

• uBlock Origin (enable all Privacy settings and lists)
• Facebook Container
• Google Container
• CSS Exfil Protection

• arkenfox/user.js
• pyllyukko/user.js
• Betterfox
• Firefox Mod Blur
• firefox-csshacks
• Gecko Dev
• firefox.js