It seems that the issue was caused by https://searchfox.org/mozilla-central/rev/cce8b90aece0f42e5025e45282de16066eeaa662/taskcluster/taskgraph/transforms/tests.py#166-168 I removed those extra quotes to have something like: 'extra-options': ['--setpref=fission.autostart=true', ........ And i did a push to try while working on "Enable Fission for Raptor" task: https://treeherder.mozilla.org/#/jobs?repo=try&revision=9bf2e5207aa3d749ccb622e4be8572084d300747&selectedJob=278420870 The logs are cleaner and the fission-enabled appears in subtest names under the Performance Tab. INFO - u'extra_prefs': ('fission.autostart=true', INFO - 'dom.serviceWorkers.parent_intercept=true', INFO - 'browser.tabs.documentchannel=true'), I'll upload the patch.
Bug 1599495 Comment 4 Edit History
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It seems that the issue was caused by https://searchfox.org/mozilla-central/rev/cce8b90aece0f42e5025e45282de16066eeaa662/taskcluster/taskgraph/transforms/tests.py#166-168 I removed those extra quotes to have something like: 'extra-options': ['--setpref=fission.autostart=true', ........ And i did a push to try while working on "Enable Fission for Raptor" task: https://treeherder.mozilla.org/#/jobs?repo=try&revision=9bf2e5207aa3d749ccb622e4be8572084d300747&selectedJob=278420870 The logs are cleaner and the fission-enabled appears in subtest names under the Performance Tab. INFO - u'extra_prefs': ('fission.autostart=true', INFO - 'dom.serviceWorkers.parent_intercept=true', INFO - 'browser.tabs.documentchannel=true'), I'll upload the patch.