I'm trying to change the private window shortcut from the default to ctrl + shift + n using autoconfig.js, but I wasn't sure how

As the title said I'm trying to customize my keyboard shortcuts with autoconfig.js, but I don't have much experience coding with javascript so I'm a little lost. The autoconfig.js solution was suggested in this thread (https://support.mozilla.org/bm/questions/1381773#answer-1517102), but the example they used was for a different shortcut. Specifically, I'm trying to change the private window shortcut from the default to ctrl + shift + n, but I wasn't sure how. If anyone could offer some guidance besides third party extensions it would be greatly appreciated 👍