gecko-dev/netwerk/cookie/test/browser/browser_serviceWorker.js

CookiePolicyHelper.runTest("ServiceWorker", {
  prefs: [
    ["dom.serviceWorkers.exemptFromPerDomainMax", true],
    ["dom.ipc.processCount", 1],
    ["dom.serviceWorkers.enabled", true],
    ["dom.serviceWorkers.testing.enabled", true],
  ],

  cookieJarAccessAllowed: async w => {
    await w.navigator.serviceWorker.register("file_empty.js").then(
      reg => { ok(true, "ServiceWorker can be used!"); return reg; },
      _ => { ok(false, "ServiceWorker cannot be used! " + _); }).then(
      reg => reg.unregister(),
      _ => { ok(false, "unregister failed"); }).
      catch(e => ok(false, "Promise rejected: " + e));
  },

  cookieJarAccessDenied: async w => {
    await w.navigator.serviceWorker.register("file_empty.js").then(
      _ => { ok(false, "ServiceWorker cannot be used!"); },
      _ => { ok(true, "ServiceWorker cannot be used!"); }).
      catch(e => ok(false, "Promise rejected: " + e));
  },
});