diff -r 000000000000 -r 6474c204b198 toolkit/components/thumbnails/test/browser_thumbnails_bg_crash_during_capture.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/thumbnails/test/browser_thumbnails_bg_crash_during_capture.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function runTests() {
+  let crashObserver = bgAddCrashObserver();
+
+  // make a good capture first - this ensures we have the <browser>
+  let goodUrl = bgTestPageURL();
+  yield bgCapture(goodUrl);
+  ok(thumbnailExists(goodUrl), "Thumbnail should be cached after capture");
+  removeThumbnail(goodUrl);
+
+  // inject our content script.
+  let mm = bgInjectCrashContentScript();
+
+  // queue up 2 captures - the first has a wait, so this is the one that
+  // will die.  The second one should immediately capture after the crash.
+  let waitUrl = bgTestPageURL({ wait: 30000 });
+  let sawWaitUrlCapture = false;
+  bgCapture(waitUrl, { onDone: () => {
+    sawWaitUrlCapture = true;
+    ok(!thumbnailExists(waitUrl), "Thumbnail should not have been saved due to the crash");
+  }});
+  bgCapture(goodUrl, { onDone: () => {
+    ok(sawWaitUrlCapture, "waitUrl capture should have finished first");
+    ok(thumbnailExists(goodUrl), "We should have recovered and completed the 2nd capture after the crash");
+    removeThumbnail(goodUrl);
+    // Test done.
+    ok(crashObserver.crashed, "Saw a crash from this test");
+    next();
+  }});
+
+  info("Crashing the thumbnail content process.");
+  mm.sendAsyncMessage("thumbnails-test:crash");
+  yield true;
+}