Looks like this was a regression from the CSS Engine rewrite. mozregression gives me this range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=f64e2b4dcf5eec0b4ad456c149680a67b7c26dc4&tochange=93dd2e456c0ecca00fb4d28744e88078a77deaf7 ...which includes: Bug 1330412 - Enable Stylo by default. r=bholley,froydnj https://hg.mozilla.org/mozilla-central/rev/7b3215e184436b77de2204e57919d1c21286727f
Bug 1757017 Comment 7 Edit History
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Looks like this was a regression from the "stylo" CSS Engine rewrite / import-from-servo. mozregression gives me this range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=f64e2b4dcf5eec0b4ad456c149680a67b7c26dc4&tochange=93dd2e456c0ecca00fb4d28744e88078a77deaf7 ...which includes: Bug 1330412 - Enable Stylo by default. r=bholley,froydnj https://hg.mozilla.org/mozilla-central/rev/7b3215e184436b77de2204e57919d1c21286727f