diff --git a/browser/devtools/netmonitor/netmonitor-view.js b/browser/devtools/netmonitor/netmonitor-view.js
index a6ce58834a4a..6cca63cfe007 100644
--- a/browser/devtools/netmonitor/netmonitor-view.js
+++ b/browser/devtools/netmonitor/netmonitor-view.js
@@ -557,6 +557,17 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
     this.refreshZebra();
   },
 
+  /**
+   * Removes all network requests and closes the sidebar if open.
+   */
+  clear: function() {
+    NetMonitorView.Sidebar.toggle(false);
+    $("#details-pane-toggle").disabled = true;
+
+    this.empty();
+    this.refreshSummary();
+  },
+
   /**
    * Predicates used when filtering items.
    *
diff --git a/browser/devtools/netmonitor/netmonitor.xul b/browser/devtools/netmonitor/netmonitor.xul
index e984a6c98670..6f508272a6fe 100644
--- a/browser/devtools/netmonitor/netmonitor.xul
+++ b/browser/devtools/netmonitor/netmonitor.xul
@@ -210,6 +210,11 @@
                class="plain requests-menu-footer-label"
                flex="1"
                crop="end"/>
+        <button id="requests-menu-clear-button"
+               class="requests-menu-footer-button"
+               onclick="NetMonitorView.RequestsMenu.clear()"
+               label="&netmonitorUI.footer.clear;">
+        </button>
       </hbox>
     </vbox>
 
diff --git a/browser/devtools/netmonitor/test/browser.ini b/browser/devtools/netmonitor/test/browser.ini
index 2b51210b3a11..4bb0b9e47369 100644
--- a/browser/devtools/netmonitor/test/browser.ini
+++ b/browser/devtools/netmonitor/test/browser.ini
@@ -26,6 +26,7 @@ support-files =
 [browser_net_accessibility-01.js]
 [browser_net_accessibility-02.js]
 [browser_net_autoscroll.js]
+[browser_net_clear.js]
 [browser_net_content-type.js]
 [browser_net_copy_url.js]
 [browser_net_cyrillic-01.js]
diff --git a/browser/devtools/netmonitor/test/browser_net_clear.js b/browser/devtools/netmonitor/test/browser_net_clear.js
new file mode 100644
index 000000000000..a78492cd7b87
--- /dev/null
+++ b/browser/devtools/netmonitor/test/browser_net_clear.js
@@ -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.");
+  }
+}
diff --git a/browser/locales/en-US/chrome/browser/devtools/netmonitor.dtd b/browser/locales/en-US/chrome/browser/devtools/netmonitor.dtd
index a056dc173fa8..4e3f1963b3ee 100644
--- a/browser/locales/en-US/chrome/browser/devtools/netmonitor.dtd
+++ b/browser/locales/en-US/chrome/browser/devtools/netmonitor.dtd
@@ -99,6 +99,10 @@
   -  in the network details footer for the "Flash" filtering button. -->
 <!ENTITY netmonitorUI.footer.filterFlash  "Flash">
 
+<!-- LOCALIZATION NOTE (debuggerUI.footer.clear): This is the label displayed
+  -  in the network details footer for the "Clear" button. -->
+<!ENTITY netmonitorUI.footer.clear  "Clear">
+
 <!-- LOCALIZATION NOTE (debuggerUI.panesButton.tooltip): This is the tooltip for
   -  the button that toggles the panes visible or hidden in the netmonitor UI. -->
 <!ENTITY netmonitorUI.panesButton.tooltip "Toggle network info">