mozregression reports: 3:23.35 INFO: Narrowed integration regression window from [f3e8f920, 62f1dc92] (3 builds) to [aeb150a0, 62f1dc92] (2 builds) (~1 steps left) 3:23.36 INFO: No more integration revisions, bisection finished. 3:23.36 INFO: Last good revision: aeb150a06b3eeeab56a698b26d9a487c891fd7a9 3:23.36 INFO: First bad revision: 62f1dc9218204d41aabac5efc3cb0a2f193dd2d2 3:23.36 INFO: Pushlog: https://hg.mozilla.org/releases/mozilla-release/pushloghtml?fromchange=aeb150a06b3eeeab56a698b26d9a487c891fd7a9&tochange=62f1dc9218204d41aabac5efc3cb0a2f193dd2d2 That's a pretty large changeset, but https://github.com/mozilla-firefox/firefox/commit/6d04f129539a, https://phabricator.services.mozilla.com/D257664 looks pretty suspicious to me. It's also possible that this is an unintended consequence of https://github.com/mozilla-firefox/firefox/commit/6d04f129539a, I'm not really familiar with the FF UI layer, so that's just speculation.
Bug 2001910 Comment 8 Edit History
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mozregression reports: 3:23.35 INFO: Narrowed integration regression window from [f3e8f920, 62f1dc92] (3 builds) to [aeb150a0, 62f1dc92] (2 builds) (~1 steps left) 3:23.36 INFO: No more integration revisions, bisection finished. 3:23.36 INFO: Last good revision: aeb150a06b3eeeab56a698b26d9a487c891fd7a9 3:23.36 INFO: First bad revision: 62f1dc9218204d41aabac5efc3cb0a2f193dd2d2 3:23.36 INFO: Pushlog: https://hg.mozilla.org/releases/mozilla-release/pushloghtml?fromchange=aeb150a06b3eeeab56a698b26d9a487c891fd7a9&tochange=62f1dc9218204d41aabac5efc3cb0a2f193dd2d2