Settings : export and import them
A a way to export and import settings. Seem to be easy to do (https://stackoverflow.com/a/34816783)
Need in some case to merge some values of settings if new or missing when apply.
Export
copy(JSON.stringify(localStorage));
This will copy your localStorage to your clipboard. (You need two JSON.stringify()'s to get the quotes escaped.)
Import
var data = JSON.parse(/*paste stringified JSON from clipboard*/);
Object.keys(data).forEach(function (k) {
localStorage.setItem(k, JSON.stringify(data[k]));
});