diff -r 000000000000 -r 6474c204b198 toolkit/crashreporter/test/browser/browser_clearReports.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/crashreporter/test/browser/browser_clearReports.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,136 @@
+/* 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 clickClearReports(tab, cb) {
+  let doc = gBrowser.getBrowserForTab(tab).contentDocument;
+
+  let button = doc.getElementById("clear-reports");
+
+  if (!button) {
+    ok(false, "Button not found");
+    cb();
+    return;
+  }
+
+  let style = doc.defaultView.getComputedStyle(button, "");
+
+  isnot(style.display, "none", "Clear reports button visible");
+
+  var observer = new MutationObserver(function(mutations) {
+    for (let mutation of mutations) {
+      if (mutation.type == "attributes" &&
+          mutation.attributeName == "style") {
+        observer.disconnect();
+        is(style.display, "none", "Clear reports button hidden");
+        cb();
+      }
+    }
+  });
+  observer.observe(button, {
+      attributes: true,
+      childList: true,
+      characterData: true,
+      attributeFilter: ["style"],
+  });
+
+  button.click();
+}
+
+var promptShown = false;
+
+let oldPrompt = Services.prompt;
+Services.prompt = {
+  confirm: function() {
+    promptShown = true;
+    return true;
+  },
+};
+
+registerCleanupFunction(function () {
+  Services.prompt = oldPrompt;
+});
+
+function test() {
+  waitForExplicitFinish();
+
+  let appD = make_fake_appdir();
+  let crD = appD.clone();
+  crD.append("Crash Reports");
+
+  // Add crashes to submitted dir
+  let submitdir = crD.clone();
+  submitdir.append("submitted");
+
+  let file1 = submitdir.clone();
+  file1.append("bp-nontxt");
+  file1.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
+  let file2 = submitdir.clone();
+  file2.append("nonbp-file.txt");
+  file2.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
+  add_fake_crashes(crD, 5);
+
+  // Add crashes to pending dir
+  let pendingdir = crD.clone();
+  pendingdir.append("pending");
+
+  let crashes = add_fake_crashes(crD, 2);
+  addPendingCrashreport(crD, crashes[0].date);
+  addPendingCrashreport(crD, crashes[1].date);
+
+  // Add crashes to reports dir
+  let report1 = crD.clone();
+  report1.append("NotInstallTime777");
+  report1.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
+  let report2 = crD.clone();
+  report2.append("InstallTime" + Services.appinfo.appBuildID);
+  report2.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
+  let report3 = crD.clone();
+  report3.append("InstallTimeNew");
+  report3.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
+  let report4 = crD.clone();
+  report4.append("InstallTimeOld");
+  report4.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0666);
+  report4.lastModifiedTime = Date.now() - 63172000000;
+
+  let tab = gBrowser.selectedTab = gBrowser.addTab("about:blank");
+
+  registerCleanupFunction(function () {
+    cleanup_fake_appdir();
+    gBrowser.removeTab(tab);
+  });
+
+  let browser = gBrowser.getBrowserForTab(tab);
+
+  browser.addEventListener("load", function onLoad() {
+    browser.removeEventListener("load", onLoad, true);
+
+    executeSoon(function() {
+      let dirs = [ submitdir, pendingdir, crD ];
+      let existing = [ file1.path, file2.path, report1.path, report2.path,
+                       report3.path, submitdir.path, pendingdir.path ];
+
+      clickClearReports(tab, function() {
+        for (let dir of dirs) {
+          let entries = dir.directoryEntries;
+          while (entries.hasMoreElements()) {
+            let file = entries.getNext().QueryInterface(Ci.nsIFile);
+            let index = existing.indexOf(file.path);
+            isnot(index, -1, file.leafName + " exists");
+
+            if (index != -1) {
+              existing.splice(index, 1);
+            }
+          }
+        }
+
+        is(existing.length, 0, "All the files that should still exist exist");
+        ok(promptShown, "Prompt shown");
+
+        finish();
+      });
+    });
+  }, true);
+
+  browser.loadURI("about:crashes", null, null);
+}