So, the blog post says:

   > Because something fundamental has been lost.
   > Zero telemetry, privacy‑first access to the internet: a basic human right.
   > We believe there needs to be a different path: a browser that answers only to its user.

Disable Daily Ping and Crash Reports in Firefox Focus and you too have a telemetry-free browser on iOS.

Meanwhile on macOS you have Mullvad Browser.

I dropped firefox 9 months so after they updated their privacy policy and removed "we don't sell your data" from their FAQ.

Besides, it doesn't seem like I'm able to install sponsorblock, ublockock origin etc on iOS firefox. I love using sponsorblock and several other add-ons from both Mazzella in chrome in Orion on my phone.