The Tor (The Onion Router) team and Mozilla are working together to implement Tor browser patches directly into Firefox and tighten their collaboration.

The Tor browser is built almost entirely on Firefox, with 95% of its code coming from Mozilla’s browser. However, it still needs a series of changes, which the team refers to as patches. As part of the strengthened collaboration, these patches are set to become part of Firefox, albeit they will be disabled by default.