Check whether the extension has the 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.

This is an asynchronous function that returns a Promise. The promise is fulfilled with true only if all the extension currently has all the given permissions. For host permissions, if the extension's permissions pattern-match the permissions listed in origins, then they are considered to match.


let getContains = browser.permissions.contains(
  permissions                // Permissions object


Return value

A Promise that will be fulfilled with true if the extension already has all the permissions listed in the permissions argument, or false otherwise.

Browser compatibility

BCD tables only load in the browser


// Extension permissions are:
// "webRequest", "tabs", "*://**"

let testPermissions1 = {
  origins: ["*://"],
  permissions: ["tabs"],

const testResult1 = await browser.permissions.contains(testPermissions1);
console.log(testResult1); // true

let testPermissions2 = {
  origins: ["*://"],
  permissions: ["tabs", "alarms"],

const testResult2 = await browser.permissions.contains(testPermissions2);
console.log(testResult2); // false, "alarms" doesn't match

let testPermissions3 = {
  origins: [""],
  permissions: ["tabs", "webRequest"],

const testResult3 = await browser.permissions.contains(testPermissions3);
console.log(testResult3); // true: "", matches: "*://**"

let testPermissions4 = {
  origins: [""],

const testResult4 = await browser.permissions.contains(testPermissions4);
console.log(testResult4); // false: "", `origins` doesn't match

Example extensions

Note: This API is based on Chromium's chrome.permissions API.