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Edit the section Background.
In 2016, we started the Tor Uplift project to take the Tor Browser patches and "uplift" them to Firefox. When a patch gets uplifted, we take the change that Tor Browser needs and we add it to Firefox in such a way that it is disabled by default, but can be enabled by changing a preference value. The Tor Uplift project saves the Tor Browser team work since they can just change preferences instead of updating patches. It also gives the Firefox team a way to experiment with the advanced privacy features that Tor Browser team is building, to see if we can bring them to a much wider audience.
The primary target in the Tor Uplift project is was two features.* : [https://wiki.mozilla.org/Security/FirstPartyIsolation '''First Party Isolation''']** First Party Isolation (also called "double keying") was incorporated in Firefox 52 with the preference "privacy.firstparty.isolate". It provides a very strong anti-tracking protection by preventing third parties from tracking users across multiple sites.* and [https://wiki.mozilla.org/Security/Fingerprinting '''Fingerprinting Resistance''']** . First Party Isolation was shipped in Firefox 52 (off by default); the MVP of Fingerprinting Resistance will be shipped in Firefox 59 (also called "anti-fingerprinting"off by default) was incorporated in Firefox 59 with the preference "privacy.resistFingerprinting". It is a defense against browser fingerprinting, which is a widely used Web tracking technology to identify individuals.
'''Fusion''' is the next big step of the Mozilla and Tor collaboration. We hope to move the needle on Web privacy based on the success of the Tor Uplift work.
