diff -r 000000000000 -r 6474c204b198 toolkit/components/thumbnails/test/browser_thumbnails_bug818225.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/thumbnails/test/browser_thumbnails_bug818225.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const URL = "http://mochi.test:8888/browser/toolkit/components/thumbnails/" +
+            "test/background_red.html?" + Date.now();
+
+// Test PageThumbs API function getThumbnailPath
+function runTests() {
+
+  let path = PageThumbs.getThumbnailPath(URL);
+  yield testIfExists(path, false, "Thumbnail file does not exist");
+
+  yield addVisitsAndRepopulateNewTabLinks(URL, next);
+  yield createThumbnail(URL);
+
+  path = PageThumbs.getThumbnailPath(URL);
+  let expectedPath = PageThumbsStorage.getFilePathForURL(URL);
+  is(path, expectedPath, "Thumbnail file has correct path");
+
+  yield testIfExists(path, true, "Thumbnail file exists");
+
+}
+
+function createThumbnail(aURL) {
+  addTab(aURL, function () {
+    whenFileExists(aURL, function () {
+      gBrowser.removeTab(gBrowser.selectedTab);
+      next();
+    });
+  });
+}
+
+function testIfExists(aPath, aExpected, aMessage) {
+  return OS.File.exists(aPath).then(
+    function onSuccess(exists) {
+      is(exists, aExpected, aMessage);
+    },
+    function onFailure(error) {
+      ok(false, "OS.File.exists() failed " + error);
+    }
+  );
+}