user.js

A user.js is a configuration file that can control hundreds of Firefox settings. For a more technical breakdown and explanation, you can read more on the overview wiki page.

ghacks user.js

The ghacks user.js is a template which aims to provide as much privacy and enhanced security as possible, and to reduce tracking and fingerprinting as much as possible - while minimizing any loss of functionality and breakage (but it will happen).

Everyone, experts included, should at least read the implementation wiki page, as it contains important information regarding a few ghacks user.js settings.

Note that we do not recommend connecting over Tor on Firefox. Use the Tor Browser if your threat model calls for it, or for accessing hidden services.

Also be aware that this user.js is made specifically for desktop Firefox. Using it as-is in other Gecko-based browsers can be counterproductive, especially in the Tor Browser.

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acknowledgments

Literally thousands of sources, references and suggestions. That said...

• Martin Brinkmann at ghacks ¹
• The ghacks community and commentators
• 12bytes
  • The 12bytes article now uses this user.js and supplements it with an additional JS hosted at Codeberg

¹ The ghacks user.js was an independent project by Thorin-Oakenpants started in early 2015 and was first published at ghacks in August 2015. With Martin Brinkmann's blessing, it will keep the ghacks name.