It was all after Snowdens leaks. Mozilla promised to de-fork Tor browser, move Tor into private browsing. They kept repeating this for years and years.
They even started a bunch of Tor nodes to collect some metrics. It looks like they are removing their blog posts about it
https://blog.mozilla.org/it/2015/01/28/deploying-tor-relays/
https://web.archive.org/web/20150722100146/https://blog.mozi...
> Our primary goal is to un-fork the Tor Browser
https://bugzilla.mozilla.org/show_bug.cgi?id=1173199#c31
They were very vocal about how web is broken, needs more Tor and IPFS for everything to allow more free speech for disadvantage. Today they promote unregulated censorship, banning and shadow-banning public channels. You will find many posts about it between 2014 and 2018.
Interesting. When Mozilla promise this, and what sort of time frame were they talking about?
Presumably "more private browsing" has been delivered somewhat already in Firefox?