diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug304198.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug304198.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,125 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function test() {
+  waitForExplicitFinish();
+
+  let charsToDelete, deletedURLTab, fullURLTab, partialURLTab, testPartialURL, testURL;
+
+  charsToDelete = 5;
+  deletedURLTab = gBrowser.addTab();
+  fullURLTab = gBrowser.addTab();
+  partialURLTab = gBrowser.addTab();
+  testURL = "http://example.org/browser/browser/base/content/test/general/dummy_page.html";
+
+  function cleanUp() {
+    gBrowser.removeTab(fullURLTab);
+    gBrowser.removeTab(partialURLTab);
+    gBrowser.removeTab(deletedURLTab);
+  }
+
+  function cycleTabs() {
+    gBrowser.selectedTab = fullURLTab;
+    is(gURLBar.value, testURL, 'gURLBar.value should be testURL after switching back to fullURLTab');
+
+    gBrowser.selectedTab = partialURLTab;
+    is(gURLBar.value, testPartialURL, 'gURLBar.value should be testPartialURL after switching back to partialURLTab');
+
+    gBrowser.selectedTab = deletedURLTab;
+    is(gURLBar.value, '', 'gURLBar.value should be "" after switching back to deletedURLTab');
+
+    gBrowser.selectedTab = fullURLTab;
+    is(gURLBar.value, testURL, 'gURLBar.value should be testURL after switching back to fullURLTab');
+  }
+
+  // function borrowed from browser_bug386835.js
+  function load(tab, url, cb) {
+    tab.linkedBrowser.addEventListener("load", function (event) {
+      event.currentTarget.removeEventListener("load", arguments.callee, true);
+      cb();
+    }, true);
+    tab.linkedBrowser.loadURI(url);
+  }
+
+  function urlbarBackspace(cb) {
+    gBrowser.selectedBrowser.focus();
+    gURLBar.addEventListener("focus", function () {
+      gURLBar.removeEventListener("focus", arguments.callee, false);
+      gURLBar.addEventListener("input", function () {
+        gURLBar.removeEventListener("input", arguments.callee, false);
+        cb();
+      }, false);
+      executeSoon(function () {
+        EventUtils.synthesizeKey("VK_BACK_SPACE", {});
+      });
+    }, false);
+    gURLBar.focus();
+  }
+
+  function prepareDeletedURLTab(cb) {
+    gBrowser.selectedTab = deletedURLTab;
+    is(gURLBar.value, testURL, 'gURLBar.value should be testURL after initial switch to deletedURLTab');
+
+    // simulate the user removing the whole url from the location bar
+    gPrefService.setBoolPref("browser.urlbar.clickSelectsAll", true);
+
+    urlbarBackspace(function () {
+      is(gURLBar.value, "", 'gURLBar.value should be "" (just set)');
+      if (gPrefService.prefHasUserValue("browser.urlbar.clickSelectsAll"))
+        gPrefService.clearUserPref("browser.urlbar.clickSelectsAll");
+      cb();
+    });
+  }
+
+  function prepareFullURLTab(cb) {
+    gBrowser.selectedTab = fullURLTab;
+    is(gURLBar.value, testURL, 'gURLBar.value should be testURL after initial switch to fullURLTab');
+    cb();
+  }
+
+  function preparePartialURLTab(cb) {
+    gBrowser.selectedTab = partialURLTab;
+    is(gURLBar.value, testURL, 'gURLBar.value should be testURL after initial switch to partialURLTab');
+
+    // simulate the user removing part of the url from the location bar
+    gPrefService.setBoolPref("browser.urlbar.clickSelectsAll", false);
+
+    var deleted = 0;
+    urlbarBackspace(function () {
+      deleted++;
+      if (deleted < charsToDelete) {
+        urlbarBackspace(arguments.callee);
+      } else {
+        is(gURLBar.value, testPartialURL, "gURLBar.value should be testPartialURL (just set)");
+        if (gPrefService.prefHasUserValue("browser.urlbar.clickSelectsAll"))
+          gPrefService.clearUserPref("browser.urlbar.clickSelectsAll");
+        cb();
+      }
+    });
+  }
+
+  function runTests() {
+    testURL = gURLBar.trimValue(testURL);
+    testPartialURL = testURL.substr(0, (testURL.length - charsToDelete));
+
+    // prepare the three tabs required by this test
+    prepareFullURLTab(function () {
+      preparePartialURLTab(function () {
+        prepareDeletedURLTab(function () {
+          // now cycle the tabs and make sure everything looks good
+          cycleTabs();
+          cleanUp();
+          finish();
+        });
+      });
+    });
+  }
+
+  load(deletedURLTab, testURL, function() {
+    load(fullURLTab, testURL, function() {
+      load(partialURLTab, testURL, runTests);
+    });
+  });
+}
+