diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_keywordSearch_postData.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_keywordSearch_postData.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,94 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ **/
+
+var gTests = [
+  {
+    name: "normal search (search service)",
+    testText: "test search",
+    expectText: "test+search"
+  },
+  {
+    name: "?-prefixed search (search service)",
+    testText: "?   foo  ",
+    expectText: "foo"
+  }
+];
+
+function test() {
+  waitForExplicitFinish();
+
+  let tab = gBrowser.selectedTab = gBrowser.addTab();
+
+  let searchObserver = function search_observer(aSubject, aTopic, aData) {
+    let engine = aSubject.QueryInterface(Ci.nsISearchEngine);
+    info("Observer: " + aData + " for " + engine.name);
+
+    if (aData != "engine-added")
+      return;
+
+    if (engine.name != "POST Search")
+      return;
+
+    Services.search.defaultEngine = engine;
+
+    registerCleanupFunction(function () {
+      Services.search.removeEngine(engine);
+    });
+
+    // ready to execute the tests!
+    executeSoon(nextTest);
+  };
+
+  Services.obs.addObserver(searchObserver, "browser-search-engine-modified", false);
+
+  registerCleanupFunction(function () {
+    gBrowser.removeTab(tab);
+
+    Services.obs.removeObserver(searchObserver, "browser-search-engine-modified");
+  });
+
+  Services.search.addEngine("http://test:80/browser/browser/base/content/test/general/POSTSearchEngine.xml",
+                            Ci.nsISearchEngine.DATA_XML, null, false);
+}
+
+var gCurrTest;
+function nextTest() {
+  if (gTests.length) {
+    gCurrTest = gTests.shift();
+    doTest();
+  } else {
+    finish();
+  }
+}
+
+function doTest() {
+  info("Running test: " + gCurrTest.name);
+
+  waitForLoad(function () {
+    let loadedText = gBrowser.contentDocument.body.textContent;
+    ok(loadedText, "search page loaded");
+    let needle = "searchterms=" + gCurrTest.expectText;
+    is(loadedText, needle, "The query POST data should be returned in the response");
+    nextTest();
+  });
+
+  // Simulate a user entering search terms
+  gURLBar.value = gCurrTest.testText;
+  gURLBar.focus();
+  EventUtils.synthesizeKey("VK_RETURN", {});
+}
+
+
+function waitForLoad(cb) {
+  let browser = gBrowser.selectedBrowser;
+  browser.addEventListener("load", function listener() {
+    if (browser.currentURI.spec == "about:blank")
+      return;
+    info("Page loaded: " + browser.currentURI.spec);
+    browser.removeEventListener("load", listener, true);
+
+    cb();
+  }, true);
+}