Is Mozilla committing publicly to supporting these new features for a significant period of time? I've been slightly wary of integrating new Firefox features into my workflow ever since they cut off support for Firefox Hello in Firefox 49.
No, not at all. These are in the Test Pilot program, which is specifically for trying new things and getting feedback if and how they should be included in Firefox.
So, most of these are not here to stay for the long term.
They might be included, they might be published as an extension either officially or just forked by someone, but overall, no guarantees on anything.
