I can reproduce the issue in Nightly100.0a1 Windows10. Regression window: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=4548a773cf089b4f42b83d990f3e6fa5f0c55743&tochange=91b890df65c564e5bbcd24b30ed576a045211fc5 Setting only javascript.options.ion.threshold to 1000 resolves the problem in the bad build and Nightly100.0a1. However, leaving javascript.options.ion.threshold at 1500(default) and setting javascript.options.warp to false does not solve the problem in the bad beild. (And javascript.options.warp is not present in Nightly100.0a1).
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I can reproduce the issue in Nightly100.0a1 Windows10. Regression window: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=4548a773cf089b4f42b83d990f3e6fa5f0c55743&tochange=91b890df65c564e5bbcd24b30ed576a045211fc5 Setting only javascript.options.ion.threshold to 1000 resolves the problem in the bad build and Nightly100.0a1. However, leaving javascript.options.ion.threshold at 1500(default) and setting javascript.options.warp to false does not solve the problem in the bad build. (And javascript.options.warp is not present in Nightly100.0a1).