This incidentally contains a (for me) novel workaround for hard-coded Firefox shortcut keys:
"...First thing you need to change default Firefox bindings like Ctrl-N. It is impossible to change or disable that bindings, but you can change the modifier key used in that bindings instead. Go to `about:config` page and set `ui.key.accelKey` to `91` (WinKey ~ Super Key). You can find more keycodes here - https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEve..., but seems like WinKey is optimal choice because both Ctrl- and Alt- bindings are needed..."
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[ 4.0 ms ] story [ 14.8 ms ] thread"...First thing you need to change default Firefox bindings like Ctrl-N. It is impossible to change or disable that bindings, but you can change the modifier key used in that bindings instead. Go to `about:config` page and set `ui.key.accelKey` to `91` (WinKey ~ Super Key). You can find more keycodes here - https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEve..., but seems like WinKey is optimal choice because both Ctrl- and Alt- bindings are needed..."