
advertising
"The company was also developing an 'experiment' through it's nightly Firefox builds to establish a means to keep advertisers happy without invasive user tracking."
My guess is that it will end up replacing "private window", so the users that don't bother initiating a private session can still be tracked by advertisers. Since they are setting up relays, it seems they are all in and will make Tor part of the core functionality of Firefox. Let's hope they can get some Tor vulnerabilities patched up before it launches.
"First, Mozilla engineers are evaluating the Tor Project’s changes to Firefox, to determine if changes to our own platform codebase can enable Tor to work more quickly and easily."
Even before Tor lands in vanilla Firefox, the Tor Browser might get improvements.