It's probably just because it's new. Here's their blog:
https://medium.com/project-tofino
I'd also recommend looking at browser.html and Servo: https://github.com/browserhtml/browserhtml
I'd also recommend looking at browser.html and Servo: https://github.com/browserhtml/browserhtml
"mozilla javascript browser project" and variations don't seem to find anything. Most come up with https://developer.mozilla.org/en-US/docs/Mozilla/Projects, which doesn't list it for some reason.
Even searching for "mozilla technologies" doesn't find it (except for articles about new technologies in general, including this article), and it's not on https://developer.mozilla.org/en-US/docs/Mozilla/Tech.
If I search for "mozilla tofino" I'm not finding any links to mozilla.org. Even restricting the search to mozilla's site only comes up with themes, addons and mailing list entries.
Any clue on why this project is so hard to identify with Mozilla?