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, as provided, aims ( with extensions ¹ ) 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).

No one size fits all and not all sites have the same requirements, so consider using multiple profiles with customized changes.

Everyone, experts included, should at least read the implementation wiki page, as it contains important information regarding a few default settings we use. The rest of the wiki is helpful as well.

acknowledgments

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

• Martin Brinkmann at ghacks ²
• The ghacks community and commentators
• 12bytes
  • The 12bytes article now uses this user.js and supplements it with an additonal JS hosted right here at github

¹ We recommend using uBlock Origin, uMatrix, and maybe a cookie extension (note: cookie & persistent storage extensions fail with First Party Isolation which we use ^bugzilla).

² 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.