Firefox

Firefox is a free and open source web browser developed for Windows, OS X and Linux, with a mobile version for Android, by Mozilla Foundation and its subsidiary, the Mozilla Corporation. Firefox uses the Gecko layout engine to render web pages, which implements current and anticipated web standards.

• Project Homepage [EN]
  • Add-ons

• Firefox [EN] @ Apple App Store
  • for iOS (iPhone) & iPadOS (iPad)

• Firefox [EN] @ Fedora Package
• Firefox [EN] @ Homebrew Cask

• Firefox [EN] @ Wikipedia
• Firefox [DE] @ Wikipedia

Documentation

• Customizing Firefox Using AutoConfig [EN] @ Mozilla Support
  • user.js file [EN] @ MozillaZine Knowledge Base

• Customizing Firefox Using policies.json [EN] @ Mozilla Support
  • Policy Templates [EN] @ Mozilla GitHub
    • Releases

• about:config entries [EN] @ MozillaZine Knowledge Base
  • security.tls.version.*

Forks

• LibreWolf

Additional Resources

12 pages found:

• Anybox
• Auto-Sort Bookmarks
• Bear
• Bitwarden
• Decentraleyes
• Joplin
• Pocket
• Privacy Badger
• Raindrop.io
• uBlock Origin
• uMatrix
• Web Developer

Configuration

• Examples
  • user.js by pyllyukko
  • user.js by ghacksuserjs

Syntax

firefox [PARAMETER ...]

Parameters

-CreateProfile NAME

Create a new profile in the default directory, but do not start application. The profile will be named NAME in the 'Profile Manager'. NAME must not contain spaces.

-CreateProfile "NAME PATH"

Creates a new profile in the PATH directory, but do not start application. The profile will be named NAME in the 'Profile Manager'.

NOTE:

NAME and PATH are quoted together, and are separated by exactly 1 space (as with the previous syntax, NAME must not contain spaces).

NOTE:

PATH must not exist and you must not already have a profile called NAME.

-new-instance

Open new instance, not a new window in running instance, which allows multiple copies of application to be open at a time.

-new-tab URL

Open URL in a new tab.

-new-window URL

Open URL in a new window.

-private

Opens Firefox in permanent private browsing mode.

-P, -ProfileManager

Start with 'Profile Manager'.

-P NAME

Bypass 'Profile Manager' and launch application with the profile named NAME. Useful for dealing with multiple profiles.

NOTE:

NAME is case sensitive.

-profile PATH

Start with the profile with the given PATH. PATH can either be an absolute path (/path/to/profile) or a relative path (path/to/profile).

-setDefaultBrowser

Set the application as the default browser.

-url [URL ...]

Open URL in a new tab or window, depend on the browser option. -url can be omitted. You may list multiple URLs, separated by spaces.

Examples

Start multiple Firefox instances with different profiles using open on macOS

for profile in 'alex' 'marty'; do
  open -a 'Firefox' -n --args -private -P "${profile}"
done