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+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta charset="utf-8">
+  <title>Test for WebExtension localization APIs</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
+  <script type="text/javascript" src="head.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="text/javascript">
+"use strict";
+
+SimpleTest.registerCleanupFunction(() => { SpecialPowers.clearUserPref("intl.accept_languages"); });
+SimpleTest.registerCleanupFunction(() => { SpecialPowers.clearUserPref("general.useragent.locale"); });
+
+add_task(function* test_i18n() {
+  function runTests(assertEq) {
+    let _ = browser.i18n.getMessage.bind(browser.i18n);
+
+    let url = browser.runtime.getURL("/");
+    assertEq(url, `moz-extension://${_("@@extension_id")}/`, "@@extension_id builtin message");
+
+    assertEq("Foo.", _("Foo"), "Simple message in selected locale.");
+
+    assertEq("(bar)", _("bar"), "Simple message fallback in default locale.");
+
+    assertEq("", _("some-unknown-locale-string"), "Unknown locale string.");
+
+    assertEq("", _("@@unknown_builtin_string"), "Unknown built-in string.");
+    assertEq("", _("@@bidi_unknown_builtin_string"), "Unknown built-in bidi string.");
+
+    assertEq("Føo.", _("Föo"), "Multi-byte message in selected locale.");
+
+    let substitutions = [];
+    substitutions[4] = "5";
+    substitutions[13] = "14";
+
+    assertEq("'$0' '14' '' '5' '$$$$' '$'.", _("basic_substitutions", substitutions),
+             "Basic numeric substitutions");
+
+    assertEq("'$0' '' 'just a string' '' '$$$$' '$'.", _("basic_substitutions", "just a string"),
+             "Basic numeric substitutions, with non-array value");
+
+    let values = _("named_placeholder_substitutions", ["(subst $1 $2)", "(2 $1 $2)"]).split("\n");
+
+    assertEq("_foo_ (subst $1 $2) _bar_", values[0], "Named and numeric substitution");
+
+    assertEq("(2 $1 $2)", values[1], "Numeric substitution amid named placeholders");
+
+    assertEq("$bad name$", values[2], "Named placeholder with invalid key");
+
+    assertEq("", values[3], "Named placeholder with an invalid value");
+
+    assertEq("Accepted, but shouldn't break.", values[4], "Named placeholder with a strange content value");
+
+    assertEq("$foo", values[5], "Non-placeholder token that should be ignored");
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      "default_locale": "jp",
+
+      content_scripts: [
+        {"matches": ["http://mochi.test/*/file_sample.html"],
+         "js": ["content.js"]},
+      ],
+    },
+
+
+    files: {
+      "_locales/en_US/messages.json": {
+        "foo": {
+          "message": "Foo.",
+          "description": "foo",
+        },
+
+        "föo": {
+          "message": "Føo.",
+          "description": "foo",
+        },
+
+        "basic_substitutions": {
+          "message": "'$0' '$14' '$1' '$5' '$$$$$' '$$'.",
+          "description": "foo",
+        },
+
+        "Named_placeholder_substitutions": {
+          "message": "$Foo$\n$2\n$bad name$\n$bad_value$\n$bad_content_value$\n$foo",
+          "description": "foo",
+          "placeholders": {
+            "foO": {
+              "content": "_foo_ $1 _bar_",
+              "description": "foo",
+            },
+
+            "bad name": {
+              "content": "Nope.",
+              "description": "bad name",
+            },
+
+            "bad_value": "Nope.",
+
+            "bad_content_value": {
+              "content": ["Accepted, but shouldn't break."],
+              "description": "bad value",
+            },
+          },
+        },
+
+        "broken_placeholders": {
+          "message": "$broken$",
+          "description": "broken placeholders",
+          "placeholders": "foo.",
+        },
+      },
+
+      "_locales/jp/messages.json": {
+        "foo": {
+          "message": "(foo)",
+          "description": "foo",
+        },
+
+        "bar": {
+          "message": "(bar)",
+          "description": "bar",
+        },
+      },
+
+      "content.js": "new " + function(runTestsFn) {
+        runTestsFn((...args) => {
+          browser.runtime.sendMessage(["assertEq", ...args]);
+        });
+
+        browser.runtime.sendMessage(["content-script-finished"]);
+      } + `(${runTests})`,
+    },
+
+    background: "new " + function(runTestsFn) {
+      browser.runtime.onMessage.addListener(([msg, ...args]) => {
+        if (msg == "assertEq") {
+          browser.test.assertEq(...args);
+        } else {
+          browser.test.sendMessage(msg, ...args);
+        }
+      });
+
+      runTestsFn(browser.test.assertEq.bind(browser.test));
+    } + `(${runTests})`,
+  });
+
+  yield extension.startup();
+
+  let win = window.open("file_sample.html");
+  yield extension.awaitMessage("content-script-finished");
+  win.close();
+
+  yield extension.unload();
+});
+
+add_task(function* test_get_accept_languages() {
+  function background() {
+    function checkResults(source, results, expected) {
+      browser.test.assertEq(
+        expected.length,
+        results.length,
+        `got expected number of languages in ${source}`);
+      results.forEach((lang, index) => {
+        browser.test.assertEq(
+          expected[index],
+          lang,
+          `got expected language in ${source}`);
+      });
+    }
+
+    let tabId;
+
+    browser.tabs.query({currentWindow: true, active: true}, tabs => {
+      tabId = tabs[0].id;
+      browser.test.sendMessage("ready");
+    });
+
+    browser.test.onMessage.addListener(async ([msg, expected]) => {
+      let contentResults = await browser.tabs.sendMessage(tabId, "get-results");
+      let backgroundResults = await browser.i18n.getAcceptLanguages();
+
+      checkResults("contentScript", contentResults, expected);
+      checkResults("background", backgroundResults, expected);
+
+      browser.test.sendMessage("done");
+    });
+  }
+
+  function content() {
+    browser.runtime.onMessage.addListener((msg, sender, respond) => {
+      browser.i18n.getAcceptLanguages(respond);
+      return true;
+    });
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      "content_scripts": [{
+        "matches": ["http://mochi.test/*/file_sample.html"],
+        "run_at": "document_start",
+        "js": ["content_script.js"],
+      }],
+    },
+
+    background,
+
+    files: {
+      "content_script.js": content,
+    },
+  });
+
+  let win = window.open("file_sample.html");
+
+  yield extension.startup();
+  yield extension.awaitMessage("ready");
+
+  let expectedLangs = ["en-US", "en"];
+  extension.sendMessage(["expect-results", expectedLangs]);
+  yield extension.awaitMessage("done");
+
+  expectedLangs = ["en-US", "en", "fr-CA", "fr"];
+  SpecialPowers.setCharPref("intl.accept_languages", expectedLangs.toString());
+  extension.sendMessage(["expect-results", expectedLangs]);
+  yield extension.awaitMessage("done");
+  SpecialPowers.clearUserPref("intl.accept_languages");
+
+  win.close();
+
+  yield extension.unload();
+});
+
+add_task(function* test_get_ui_language() {
+  function getResults() {
+    return {
+      getUILanguage: browser.i18n.getUILanguage(),
+      getMessage: browser.i18n.getMessage("@@ui_locale"),
+    };
+  }
+
+  function background(getResultsFn) {
+    function checkResults(source, results, expected) {
+      browser.test.assertEq(
+        expected,
+        results.getUILanguage,
+        `Got expected getUILanguage result in ${source}`
+      );
+      browser.test.assertEq(
+        expected,
+        results.getMessage,
+        `Got expected getMessage result in ${source}`
+      );
+    }
+
+    let tabId;
+
+    browser.test.onMessage.addListener(([msg, expected]) => {
+      browser.tabs.sendMessage(tabId, "get-results", result => {
+        checkResults("contentScript", result, expected);
+        checkResults("background", getResultsFn(), expected);
+
+        browser.test.sendMessage("done");
+      });
+    });
+
+    browser.tabs.query({currentWindow: true, active: true}, tabs => {
+      tabId = tabs[0].id;
+      browser.test.sendMessage("ready");
+    });
+  }
+
+  function content(getResultsFn) {
+    browser.runtime.onMessage.addListener((msg, sender, respond) => {
+      respond(getResultsFn());
+    });
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      "content_scripts": [{
+        "matches": ["http://mochi.test/*/file_sample.html"],
+        "run_at": "document_start",
+        "js": ["content_script.js"],
+      }],
+    },
+
+    background: `(${background})(${getResults})`,
+
+    files: {
+      "content_script.js": `(${content})(${getResults})`,
+    },
+  });
+
+  let win = window.open("file_sample.html");
+
+  yield extension.startup();
+  yield extension.awaitMessage("ready");
+
+  extension.sendMessage(["expect-results", "en_US"]);
+  yield extension.awaitMessage("done");
+
+  SpecialPowers.setCharPref("general.useragent.locale", "he");
+
+  extension.sendMessage(["expect-results", "he"]);
+  yield extension.awaitMessage("done");
+
+  win.close();
+
+  yield extension.unload();
+});
+
+
+add_task(function* test_detect_language() {
+  const af_string = " aam skukuza die naam beteken hy wat skoonvee of hy wat alles onderstebo keer wysig " +
+    "bosveldkampe boskampe is kleiner afgeleë ruskampe wat oor min fasiliteite beskik daar is geen restaurante " +
+    "of winkels nie en slegs oornagbesoekers word toegelaat bateleur";
+  // String with intermixed French/English text
+  const fr_en_string = "France is the largest country in Western Europe and the third-largest in Europe as a whole. " +
+    "A accès aux chiens et aux frontaux qui lui ont été il peut consulter et modifier ses collections et exporter " +
+    "Cet article concerne le pays européen aujourd’hui appelé République française. Pour d’autres usages du nom France, " +
+    "Pour une aide rapide et effective, veuiller trouver votre aide dans le menu ci-dessus." +
+    "Motoring events began soon after the construction of the first successful gasoline-fueled automobiles. The quick brown fox jumped over the lazy dog";
+
+  function background() {
+    function checkResult(source, result, expected) {
+      browser.test.assertEq(expected.isReliable, result.isReliable, "result.confident is true");
+      browser.test.assertEq(
+        expected.languages.length,
+        result.languages.length,
+        `result.languages contains the expected number of languages in ${source}`);
+      expected.languages.forEach((lang, index) => {
+        browser.test.assertEq(
+          lang.percentage,
+          result.languages[index].percentage,
+          `element ${index} of result.languages array has the expected percentage in ${source}`);
+        browser.test.assertEq(
+          lang.language,
+          result.languages[index].language,
+          `element ${index} of result.languages array has the expected language in ${source}`);
+      });
+    }
+
+    let tabId;
+
+    browser.tabs.query({currentWindow: true, active: true}, tabs => {
+      tabId = tabs[0].id;
+      browser.test.sendMessage("ready");
+    });
+
+    browser.test.onMessage.addListener(async ([msg, expected]) => {
+      let backgroundResults = await browser.i18n.detectLanguage(msg);
+      let contentResults = await browser.tabs.sendMessage(tabId, msg);
+
+      checkResult("background", backgroundResults, expected);
+      checkResult("contentScript", contentResults, expected);
+
+      browser.test.sendMessage("done");
+    });
+  }
+
+  function content() {
+    browser.runtime.onMessage.addListener((msg, sender, respond) => {
+      browser.i18n.detectLanguage(msg, respond);
+      return true;
+    });
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    manifest: {
+      "content_scripts": [{
+        "matches": ["http://mochi.test/*/file_sample.html"],
+        "run_at": "document_start",
+        "js": ["content_script.js"],
+      }],
+    },
+
+    background,
+
+    files: {
+      "content_script.js": content,
+    },
+  });
+
+  let win = window.open("file_sample.html");
+
+  yield extension.startup();
+  yield extension.awaitMessage("ready");
+
+  let expected = {
+    isReliable: true,
+    languages: [
+      {
+        language: "fr",
+        percentage: 67,
+      },
+      {
+        language: "en",
+        percentage: 32,
+      },
+    ],
+  };
+  extension.sendMessage([fr_en_string, expected]);
+  yield extension.awaitMessage("done");
+
+  expected = {
+    isReliable: true,
+    languages: [
+      {
+        language: "af",
+        percentage: 99,
+      },
+    ],
+  };
+  extension.sendMessage([af_string, expected]);
+  yield extension.awaitMessage("done");
+
+  win.close();
+
+  yield extension.unload();
+});
+
+</script>
+
+</body>
+</html>