diff -r 000000000000 -r 6474c204b198 browser/devtools/netmonitor/test/browser_net_clear.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/netmonitor/test/browser_net_clear.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,76 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests if the clear button empties the request menu.
+ */
+
+function test() {
+  initNetMonitor(SIMPLE_URL).then(([aTab, aDebuggee, aMonitor]) => {
+    info("Starting test... ");
+
+    let { document, $, NetMonitorView } = aMonitor.panelWin;
+    let { RequestsMenu } = NetMonitorView;
+    let detailsPane = $("#details-pane");
+    let detailsPaneToggleButton = $('#details-pane-toggle');
+    let clearButton = $('#requests-menu-clear-button');
+
+    RequestsMenu.lazyUpdate = false;
+
+    // Make sure we start in a sane state
+    assertNoRequestState(RequestsMenu, detailsPaneToggleButton);
+
+    // Load one request and assert it shows up in the lis
+    aMonitor.panelWin.once(aMonitor.panelWin.EVENTS.NETWORK_EVENT, () => {
+      assertSingleRequestState(RequestsMenu, detailsPaneToggleButton);
+
+      // Click clear and make sure the requests are gone
+      EventUtils.sendMouseEvent({ type: "click" }, clearButton);
+      assertNoRequestState(RequestsMenu, detailsPaneToggleButton);
+
+      // Load a second request and make sure they still show up
+      aMonitor.panelWin.once(aMonitor.panelWin.EVENTS.NETWORK_EVENT, () => {
+        assertSingleRequestState(RequestsMenu, detailsPaneToggleButton);
+
+        // Make sure we can now open the details pane
+        NetMonitorView.toggleDetailsPane({ visible: true, animated: false });
+        ok(!detailsPane.hasAttribute("pane-collapsed") &&
+          !detailsPaneToggleButton.hasAttribute("pane-collapsed"),
+          "The details pane should be visible after clicking the toggle button.");
+
+        // Click clear and make sure the details pane closes
+        EventUtils.sendMouseEvent({ type: "click" }, clearButton);
+        assertNoRequestState(RequestsMenu, detailsPaneToggleButton);
+        ok(detailsPane.hasAttribute("pane-collapsed") &&
+          detailsPaneToggleButton.hasAttribute("pane-collapsed"),
+          "The details pane should not be visible clicking 'clear'.");
+
+        teardown(aMonitor).then(finish);
+      });
+
+      aDebuggee.location.reload();
+    });
+
+    aDebuggee.location.reload();
+  });
+
+  /**
+   * Asserts the state of the network monitor when one request has loaded
+   */
+  function assertSingleRequestState(RequestsMenu, detailsPaneToggleButton) {
+    is(RequestsMenu.itemCount, 1,
+      "The request menu should have one item at this point.");
+    is(detailsPaneToggleButton.hasAttribute("disabled"), false,
+      "The pane toggle button should be enabled after a request is made.");
+  }
+
+  /**
+   * Asserts the state of the network monitor when no requests have loaded
+   */
+  function assertNoRequestState(RequestsMenu, detailsPaneToggleButton) {
+    is(RequestsMenu.itemCount, 0,
+      "The request menu should be empty at this point.");
+    is(detailsPaneToggleButton.hasAttribute("disabled"), true,
+      "The pane toggle button should be disabled when the request menu is cleared.");
+  }
+}