I filed a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1871041For now, try to use a different keyboard shortcut. For example ctrl-option-1 seems to work for me (as long as the curor is not in a text field).
I can also confirm that the window only bounces back when using the custom keyboard shortcut, not when using the mouse.Weirdly, it works for some keyboard shortcuts (like ctrl-option-1 or cmd-option-w) but doesn't for others (like cmd-option-q). I ca...