browser_setUserAgentOverride.js

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/* Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

const DOC = toDataURL(`<script>document.write(navigator.userAgent);</script>`);

// Network.setUserAgentOverride is a redirect to Emulation.setUserAgentOverride.

// Run at least one test for setting and resetting the user agent to make sure

// that the redirect works.

add_task(async function forwardToEmulation({ client }) {

  const { Network } = client;

  const userAgent = "Mozilla/5.0 (rv: 23) Romanesco/42.0";

  const platform = "foobar";

  await loadURL(DOC);

  const originalUserAgent = await getNavigatorProperty("userAgent");

  const originalPlatform = await getNavigatorProperty("platform");

  isnot(originalUserAgent, userAgent, "Custom user agent hasn't been set");

  isnot(originalPlatform, platform, "Custom platform hasn't been set");

  await Network.setUserAgentOverride({ userAgent, platform });

  await loadURL(DOC);

is(

    await getNavigatorProperty("userAgent"),

    userAgent,

    "Custom user agent has been set"

);

is(

    await getNavigatorProperty("platform"),

    platform,

    "Custom platform has been set"

);

  await Network.setUserAgentOverride({ userAgent: "", platform: "" });

  await loadURL(DOC);

is(

    await getNavigatorProperty("userAgent"),

    originalUserAgent,

    "Custom user agent has been reset"

);

is(

    await getNavigatorProperty("platform"),

    originalPlatform,

    "Custom platform has been reset"

);

  await Network.setUserAgentOverride({ userAgent, platform });

  await loadURL(DOC);

is(

    await getNavigatorProperty("userAgent"),

    userAgent,

    "Custom user agent has been set"

);

is(

    await getNavigatorProperty("platform"),

    platform,

    "Custom platform has been set"

);

});

async function getNavigatorProperty(prop) {

  return SpecialPowers.spawn(gBrowser.selectedBrowser, [prop], _prop => {

    return content.navigator[_prop];

});