Please test this on Nightly and Beta branches. The code changes that needed to ride the train has been uplifted to Beta because we want this to be available on 143 Release.
Bug 1984201 Comment 4 Edit History
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Please test this on Nightly and Beta branches. The code changes that needed to ride the train has been uplifted in Bug 1982959 to Beta because we want this to be available on 143 Release.