> If anything FF gets left out because usage is so low.

I've been following this for a long time. They were leaving Firefox out when its usage wasn't low.

Probably the typical backdoor executive mandate that led to death by "sprint prioritization":

Yes, we will for sure work on the Firefox compatibility bug, Dave-Open-Source-Enthusiast-Google-Dev.

But we can only pick up 10 bugfixing tickets this sprint and the ticket you highlighted, as the entire team agrees, is priority #12.

<repeat every sprint, where during the sprint 9-10 new higher priority items magically appear just in time for the next sprint>

Death by slow asphyxiation.

I heard that Firefox is banned internally at Google (something-something-security) so Devs can't even test against firefox