Looks like we still have 30 tests disabled for fission: https://searchfox.org/mozilla-central/search?q=if%5Cs*%5C%3D%5Cs*fission&path=devtools%2F**%2Fbrowser.ini&case=false®exp=true (includes fail-if & skip-if)
Bug 1601891 Comment 6 Edit History
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Looks like we still have 30 tests disabled for fission: https://searchfox.org/mozilla-central/search?q=if%5Cs*%5C%3D.*fission&path=devtools%2F**%2Fbrowser.ini&case=false®exp=true (includes fail-if & skip-if)