Definitely understand why this would be painful for Firefox given that it forces a certain architecture e.g. use of XPC, authenticated pointers and sandboxing extensions.

But equally as a user my priority is the overall security of my phone over any one particular app. And we know from decades of experience that browsers are a major source of security issues.

I wish Firefox instead of playing the victim card would instead do a white paper outlining technically why certain approaches are hard to implement, why their approach is more secure if it is and what steps they do take to protect user's security and privacy. Would help the overall discussion that's for sure.