Allow cmd+` to switch between windows on Mac

[mcfitzp]

Cmd+` is the default Mac keyboard shortcut for switching between windows within an app. It works in Safari but not in Firefox, which is extremely inconvenient. I want to stick with Firefox, but I might have to switch browsers if this can't be fixed because without this shortcut, it's very hard to drag tabs to different windows, which is something I do a lot.

[Jon]

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