Keyboard shortcuts are set as default you can't change those other then from 3rd party Addons or software only. What and how you secure your computer or laptop is up to you not for firefox forum help user forum to help with.

it is long past time for a built in shortcut to: prefs/privacy & security/logins. especially since there is no way to do this with a 3rd party app or extension. There could be a toggle for the shortcut for paranoid users who leave their laptops unlocked. The bookmark method is way out of date.

the about: url about:about will list all of the about; urls for that version. For example about:preferences#privacy

The desktop Firefox web browser already has a lot of keyboard shortcuts so it would be hard to add another. Plus there can sometimes be slight differences between Windows, macOS and Linux. https://support.mozilla.org/en-US/kb/keyboard-shortcuts-perform-firefox-tasks-quickly

this I know. obviously how I set the bookmark.

"the about: url about:about will list all of the about; urls for that version. For example about:preferences#privacy

"The desktop Firefox web browser already has a lot of keyboard shortcuts so it would be hard to add another."

Cmd/opt/P is not is use from what I see and it would save many clicks. Great browser, but little things like this would make it that much better.