Per :pierzina, these tests are running now on tier 2 under tt(c): https://searchfox.org/mozilla-central/source/taskcluster/ci/test/misc.yml#56 so, closing
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Per :raphael, these tests are running now on tier 2 under tt(c): https://searchfox.org/mozilla-central/source/taskcluster/ci/test/misc.yml#56 so, closing