new file mode 100644
--- /dev/null
+++ b/devtools/client/netmonitor/events.js
@@ -0,0 +1,86 @@
+"use strict";
+
+// The panel's window global is an EventEmitter firing the following events:
+const EVENTS = {
+  // When the monitored target begins and finishes navigating.
+  TARGET_WILL_NAVIGATE: "NetMonitor:TargetWillNavigate",
+  TARGET_DID_NAVIGATE: "NetMonitor:TargetNavigate",
+
+  // When a network or timeline event is received.
+  // See https://developer.mozilla.org/docs/Tools/Web_Console/remoting for
+  // more information about what each packet is supposed to deliver.
+  NETWORK_EVENT: "NetMonitor:NetworkEvent",
+  TIMELINE_EVENT: "NetMonitor:TimelineEvent",
+
+  // When a network event is added to the view
+  REQUEST_ADDED: "NetMonitor:RequestAdded",
+
+  // When request headers begin and finish receiving.
+  UPDATING_REQUEST_HEADERS: "NetMonitor:NetworkEventUpdating:RequestHeaders",
+  RECEIVED_REQUEST_HEADERS: "NetMonitor:NetworkEventUpdated:RequestHeaders",
+
+  // When request cookies begin and finish receiving.
+  UPDATING_REQUEST_COOKIES: "NetMonitor:NetworkEventUpdating:RequestCookies",
+  RECEIVED_REQUEST_COOKIES: "NetMonitor:NetworkEventUpdated:RequestCookies",
+
+  // When request post data begins and finishes receiving.
+  UPDATING_REQUEST_POST_DATA: "NetMonitor:NetworkEventUpdating:RequestPostData",
+  RECEIVED_REQUEST_POST_DATA: "NetMonitor:NetworkEventUpdated:RequestPostData",
+
+  // When security information begins and finishes receiving.
+  UPDATING_SECURITY_INFO: "NetMonitor::NetworkEventUpdating:SecurityInfo",
+  RECEIVED_SECURITY_INFO: "NetMonitor::NetworkEventUpdated:SecurityInfo",
+
+  // When response headers begin and finish receiving.
+  UPDATING_RESPONSE_HEADERS: "NetMonitor:NetworkEventUpdating:ResponseHeaders",
+  RECEIVED_RESPONSE_HEADERS: "NetMonitor:NetworkEventUpdated:ResponseHeaders",
+
+  // When response cookies begin and finish receiving.
+  UPDATING_RESPONSE_COOKIES: "NetMonitor:NetworkEventUpdating:ResponseCookies",
+  RECEIVED_RESPONSE_COOKIES: "NetMonitor:NetworkEventUpdated:ResponseCookies",
+
+  // When event timings begin and finish receiving.
+  UPDATING_EVENT_TIMINGS: "NetMonitor:NetworkEventUpdating:EventTimings",
+  RECEIVED_EVENT_TIMINGS: "NetMonitor:NetworkEventUpdated:EventTimings",
+
+  // When response content begins, updates and finishes receiving.
+  STARTED_RECEIVING_RESPONSE: "NetMonitor:NetworkEventUpdating:ResponseStart",
+  UPDATING_RESPONSE_CONTENT: "NetMonitor:NetworkEventUpdating:ResponseContent",
+  RECEIVED_RESPONSE_CONTENT: "NetMonitor:NetworkEventUpdated:ResponseContent",
+
+  // When the request post params are displayed in the UI.
+  REQUEST_POST_PARAMS_DISPLAYED: "NetMonitor:RequestPostParamsAvailable",
+
+  // When the response body is displayed in the UI.
+  RESPONSE_BODY_DISPLAYED: "NetMonitor:ResponseBodyAvailable",
+
+  // When the html response preview is displayed in the UI.
+  RESPONSE_HTML_PREVIEW_DISPLAYED: "NetMonitor:ResponseHtmlPreviewAvailable",
+
+  // When the image response thumbnail is displayed in the UI.
+  RESPONSE_IMAGE_THUMBNAIL_DISPLAYED:
+    "NetMonitor:ResponseImageThumbnailAvailable",
+
+  // When a tab is selected in the NetworkDetailsView and subsequently rendered.
+  TAB_UPDATED: "NetMonitor:TabUpdated",
+
+  // Fired when Sidebar has finished being populated.
+  SIDEBAR_POPULATED: "NetMonitor:SidebarPopulated",
+
+  // Fired when NetworkDetailsView has finished being populated.
+  NETWORKDETAILSVIEW_POPULATED: "NetMonitor:NetworkDetailsViewPopulated",
+
+  // Fired when CustomRequestView has finished being populated.
+  CUSTOMREQUESTVIEW_POPULATED: "NetMonitor:CustomRequestViewPopulated",
+
+  // Fired when charts have been displayed in the PerformanceStatisticsView.
+  PLACEHOLDER_CHARTS_DISPLAYED: "NetMonitor:PlaceholderChartsDisplayed",
+  PRIMED_CACHE_CHART_DISPLAYED: "NetMonitor:PrimedChartsDisplayed",
+  EMPTY_CACHE_CHART_DISPLAYED: "NetMonitor:EmptyChartsDisplayed",
+
+  // Fired once the NetMonitorController establishes a connection to the debug
+  // target.
+  CONNECTED: "connected",
+};
+
+exports.EVENTS = EVENTS;

--- a/devtools/client/netmonitor/moz.build
+++ b/devtools/client/netmonitor/moz.build
@@ -3,16 +3,17 @@
 # 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/.
 
 DIRS += [
     'har'
 ]
 
 DevToolsModules(
+    'events.js',
     'filter-predicates.js',
     'l10n.js',
     'panel.js',
     'prefs.js',
     'request-utils.js',
     'requests-menu-view.js',
 )
 

--- a/devtools/client/netmonitor/netmonitor-controller.js
+++ b/devtools/client/netmonitor/netmonitor-controller.js
@@ -4,99 +4,16 @@
  * 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/. */
 /* globals window, document, NetMonitorView */
 /* exported loader */
 "use strict";
 
 var { utils: Cu } = Components;
 
-// The panel's window global is an EventEmitter firing the following events:
-const EVENTS = {
-  // When the monitored target begins and finishes navigating.
-  TARGET_WILL_NAVIGATE: "NetMonitor:TargetWillNavigate",
-  TARGET_DID_NAVIGATE: "NetMonitor:TargetNavigate",
-
-  // When a network or timeline event is received.
-  // See https://developer.mozilla.org/docs/Tools/Web_Console/remoting for
-  // more information about what each packet is supposed to deliver.
-  NETWORK_EVENT: "NetMonitor:NetworkEvent",
-  TIMELINE_EVENT: "NetMonitor:TimelineEvent",
-
-  // When a network event is added to the view
-  REQUEST_ADDED: "NetMonitor:RequestAdded",
-
-  // When request headers begin and finish receiving.
-  UPDATING_REQUEST_HEADERS: "NetMonitor:NetworkEventUpdating:RequestHeaders",
-  RECEIVED_REQUEST_HEADERS: "NetMonitor:NetworkEventUpdated:RequestHeaders",
-
-  // When request cookies begin and finish receiving.
-  UPDATING_REQUEST_COOKIES: "NetMonitor:NetworkEventUpdating:RequestCookies",
-  RECEIVED_REQUEST_COOKIES: "NetMonitor:NetworkEventUpdated:RequestCookies",
-
-  // When request post data begins and finishes receiving.
-  UPDATING_REQUEST_POST_DATA: "NetMonitor:NetworkEventUpdating:RequestPostData",
-  RECEIVED_REQUEST_POST_DATA: "NetMonitor:NetworkEventUpdated:RequestPostData",
-
-  // When security information begins and finishes receiving.
-  UPDATING_SECURITY_INFO: "NetMonitor::NetworkEventUpdating:SecurityInfo",
-  RECEIVED_SECURITY_INFO: "NetMonitor::NetworkEventUpdated:SecurityInfo",
-
-  // When response headers begin and finish receiving.
-  UPDATING_RESPONSE_HEADERS: "NetMonitor:NetworkEventUpdating:ResponseHeaders",
-  RECEIVED_RESPONSE_HEADERS: "NetMonitor:NetworkEventUpdated:ResponseHeaders",
-
-  // When response cookies begin and finish receiving.
-  UPDATING_RESPONSE_COOKIES: "NetMonitor:NetworkEventUpdating:ResponseCookies",
-  RECEIVED_RESPONSE_COOKIES: "NetMonitor:NetworkEventUpdated:ResponseCookies",
-
-  // When event timings begin and finish receiving.
-  UPDATING_EVENT_TIMINGS: "NetMonitor:NetworkEventUpdating:EventTimings",
-  RECEIVED_EVENT_TIMINGS: "NetMonitor:NetworkEventUpdated:EventTimings",
-
-  // When response content begins, updates and finishes receiving.
-  STARTED_RECEIVING_RESPONSE: "NetMonitor:NetworkEventUpdating:ResponseStart",
-  UPDATING_RESPONSE_CONTENT: "NetMonitor:NetworkEventUpdating:ResponseContent",
-  RECEIVED_RESPONSE_CONTENT: "NetMonitor:NetworkEventUpdated:ResponseContent",
-
-  // When the request post params are displayed in the UI.
-  REQUEST_POST_PARAMS_DISPLAYED: "NetMonitor:RequestPostParamsAvailable",
-
-  // When the response body is displayed in the UI.
-  RESPONSE_BODY_DISPLAYED: "NetMonitor:ResponseBodyAvailable",
-
-  // When the html response preview is displayed in the UI.
-  RESPONSE_HTML_PREVIEW_DISPLAYED: "NetMonitor:ResponseHtmlPreviewAvailable",
-
-  // When the image response thumbnail is displayed in the UI.
-  RESPONSE_IMAGE_THUMBNAIL_DISPLAYED:
-    "NetMonitor:ResponseImageThumbnailAvailable",
-
-  // When a tab is selected in the NetworkDetailsView and subsequently rendered.
-  TAB_UPDATED: "NetMonitor:TabUpdated",
-
-  // Fired when Sidebar has finished being populated.
-  SIDEBAR_POPULATED: "NetMonitor:SidebarPopulated",
-
-  // Fired when NetworkDetailsView has finished being populated.
-  NETWORKDETAILSVIEW_POPULATED: "NetMonitor:NetworkDetailsViewPopulated",
-
-  // Fired when CustomRequestView has finished being populated.
-  CUSTOMREQUESTVIEW_POPULATED: "NetMonitor:CustomRequestViewPopulated",
-
-  // Fired when charts have been displayed in the PerformanceStatisticsView.
-  PLACEHOLDER_CHARTS_DISPLAYED: "NetMonitor:PlaceholderChartsDisplayed",
-  PRIMED_CACHE_CHART_DISPLAYED: "NetMonitor:PrimedChartsDisplayed",
-  EMPTY_CACHE_CHART_DISPLAYED: "NetMonitor:EmptyChartsDisplayed",
-
-  // Fired once the NetMonitorController establishes a connection to the debug
-  // target.
-  CONNECTED: "connected",
-};
-
 // Descriptions for what this frontend is currently doing.
 const ACTIVITY_TYPE = {
   // Standing by and handling requests normally.
   NONE: 0,
 
   // Forcing the target to reload with cache enabled or disabled.
   RELOAD: {
     WITH_CACHE_ENABLED: 1,
@@ -119,16 +36,17 @@ var { loader, require } = BrowserLoaderM
 const promise = require("promise");
 const Services = require("Services");
 const {XPCOMUtils} = require("resource://gre/modules/XPCOMUtils.jsm");
 const EventEmitter = require("devtools/shared/event-emitter");
 const Editor = require("devtools/client/sourceeditor/editor");
 const {TimelineFront} = require("devtools/shared/fronts/timeline");
 const {Task} = require("devtools/shared/task");
 const {Prefs} = require("./prefs");
+const {EVENTS} = require("./events");
 
 XPCOMUtils.defineConstant(this, "EVENTS", EVENTS);
 XPCOMUtils.defineConstant(this, "ACTIVITY_TYPE", ACTIVITY_TYPE);
 XPCOMUtils.defineConstant(this, "Editor", Editor);
 XPCOMUtils.defineConstant(this, "Prefs", Prefs);
 
 XPCOMUtils.defineLazyModuleGetter(this, "Chart",
   "resource://devtools/client/shared/widgets/Chart.jsm");