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.
>Firefox makes up about 90 percent of Mozilla’s revenue, according to Muhlheim, the finance chief for the organization’s for-profit arm — which in turn helps fund the nonprofit Mozilla Foundation. About 85 percent of that revenue comes from its deal with Google, he added.
https://www.theverge.com/news/660548/firefox-google-search-r...
Billion with a B, as in 10 zeroes, not 7.