Mozregression could only give me this range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c9d499871dc8c87d1f138d1a954b675df5030a43&tochange=06c7b4e2d14be1ee8050d6c1eb1ab1bab19ac3c2 That includes when Fission was enabled for Firefox 97 (in bug 1732358).
Bug 1888904 Comment 2 Edit History
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Mozregression could only give me this range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c9d499871dc8c87d1f138d1a954b675df5030a43&tochange=06c7b4e2d14be1ee8050d6c1eb1ab1bab19ac3c2 That includes when Fission was enabled for Firefox 97 (in bug 1732358). For what it's worth, I got the same range when I ran another mozregression on earlier builds (back to Firefox 70) with the webrender and fission autostart prefs on.