So, there is still the problem with the sandbox and the only way you have hw acceleration is to disable the sandbox, I bet it is elfarto VA API adapter library. And what about FF Android?
The problem with iron fox is that it's so hardened about privacy that it breaks functionality l, for example you can't even use add-ons if you don't enable it first, it is disabled by default...
I agree it depends about your security threat model. The browser, being open source is subject of several audits in the past, I don't think if an organization just because being alphabet or Mozilla is inherently more safe, as it would have a lot of malware in chrome and firefox extensions for example, poor extension control from them...
I mean I don't like that Mozilla donations finance weird congresses on Africa, that sounds like they are going to SPAs and getting a lot of sex with donation money instead of improving FF.