I managed to reproduce this issue on Firefox Beta 96, Nightly 98.0a1, Release 95 and 91.5.0esr using macOS 11.6 (Big Sur), Windows 10 and Ubuntu 20.04. This looks like an older regression, reproduced it all the way to Firefox 85. Using mozregression, looked for a regression ranged and took me to: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=61c35792ca7021377e42150db54b3935b0fd3c40&tochange=b1a74943bc51bd3e62ea52242ec5e403ea3760bb I suspect Bug 1641287 to be the culprit. Daisuke, could you please take a look?
Bug 1749397 Comment 3 Edit History
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I suspect Bug 1641287 to be the culprit. Daisuke, could you please take a look?
Daisuke, could you please take a look?