permissions.request()

Ask for the set of permissions listed in the given permissions.Permissions object.

The Permissions argument may contain either an origins property, which is an array of host permissions, or a permissions property, which is an array of API permissions, or both. Permissions must come from the set of permissions defined in the optional_permissions manifest.json key. The origins property may include permissions that match a subset of the hosts matched by an optional permission: for example, if optional_permissions include "*://mozilla.org/", then permissions.origins may include "https://developer.mozilla.org/".

The request can only be made inside the handler for a user action.

Depending on a circumstances, the browser will probably handle the request by asking the user whether to grant the requested permissions. Only a single request is made for all requested permissions: thus either all permissions are granted or none of them are.

Any permissions granted are retained by the extension, even over upgrade and disable/enable cycling.

This is an asynchronous function that returns a Promise.

let requesting = browser.permissions.request(
  permissions                // Permissions object
)

const permissionsToRequest = {
  permissions: ["bookmarks", "history"],
  origins: ["https://developer.mozilla.org/"]
}

async function requestPermissions() {

  function onResponse(response) {
    if (response) {
      console.log("Permission was granted");
    } else {
      console.log("Permission was refused");
    }
    return browser.permissions.getAll();
  }

  const response = await browser.permissions.request(permissionsToRequest);
  const currentPermissions = await onResponse(response);

  console.log(`Current permissions:`, currentPermissions);
}

document.querySelector("#request").addEventListener("click", requestPermissions);