Based on Dale's [comments in Bug 1918446](https://bugzilla.mozilla.org/show_bug.cgi?id=1918446#c1), it has not regressed Nightly with the pref off. When I was testing it with the `urlbar.scotchBonnet.enableOverride` OFF, the `urlbar.secondaryActions.featureGate` was ON for me. That's why it seemed like it regressed Nightly, but if secondaryActions is OFF. The the behaviour is fine and switch to tabs works normally. However, we still need to fix this and we want switch to tabs working properly before release. It is still a blocker for Bug 1916679.
Bug 1918437 Comment 5 Edit History
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Based on Dale's [comments in Bug 1918446](https://bugzilla.mozilla.org/show_bug.cgi?id=1918446#c1), it has not regressed Nightly with the pref off. When I was testing it with the `urlbar.scotchBonnet.enableOverride` OFF, the `urlbar.secondaryActions.featureGate` was ON for me. That's why it seemed like it regressed Nightly, but if secondaryActions is OFF the behaviour is fine and switch to tabs works normally. However, we still need to fix this and we want switch to tabs working properly before release. It is still a blocker for Bug 1916679.