I think the main problem is that the per-test mozinfo does not have 'fission' set. There is some per-test mozinfo manipulation at -central/rev/9bc5dcea99c59dc18eae0de7064131aa20cfbb66/testing/mozharness/mozharness/mozilla/testing/per_test_base.py#324Maybe that should be expanded for fission, either based on mozharness configuration, or --setprefs?
How to Enable Fission in Mozilla Firefox 69
FYI, my setup is the 11th tiger lake intel platform with its iris xe graphics, and even the av1 hardware decode is working on firefox for me; while I find the playback of av1 content with hardware decoding enabled is not that smooth compared to that of avc or vp9. 2ff7e9595c
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