Comment by araes

They actually have an Enterprise Edition [1]

[1] https://www.firefox.com/en-US/browsers/enterprise/

Features: [2]

  - Rapid Release or Extended Support Release channels
  - MSI deployment wrapper
  - ADM and AMDX group policy templates
  - MacOS plist file policy templates
  - Linux target JSON file “policies.json” policy templates
  - “Open in IE” extension for ActiveX

Does not have the built-in DLP you're requesting (at as far as I could find) and Firefox already has pretty aggressive adblocking that sets off lots of sites for me.

[2] https://support.mozilla.org/en-US/kb/firefox-enterprise-vs-n...