Allow programmatically modifying Override keyboard shortcuts permission per origin

[MrQubo]

I would like to be able to control "Override keyboard shortcuts" permission programmatically for individual origins.

Currently, it's possible to modify this permission manually from the "Page Info" window, "Permissions" tab.

Programmatically, it's possible to modify this permission globally for all websites by setting "permissions.default.shortcuts" from "user.js" or "prefs.js".

It's also possible to control permissions individually per origin using "policies.json" (https://mozilla.github.io/policy-templates/#permissions), but only some of the permissions are present there, and 'shortcuts' is not among them.

[Jon]

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