holy shit mozilla has a new issue tracker documenting all of the ways that apple, google, and microsoft purposefully put third party browsers at a disadvantage and is calling for action https://mozilla.github.io/platform-tilt/
Platform Tilt - Mozilla
Platform Tilt tracks technical issues in major software platforms which disadvantage Firefox relative to the first-party browser.
@nano Starting with "App Store forbids third-party browser engines #1" which is a consequence of Apple's already abusive policy forbidding the end user from scripting their phone.