--- a/devtools/client/netmonitor/components/request-list.js
+++ b/devtools/client/netmonitor/components/request-list.js
@@ -84,17 +84,16 @@ const RequestList = createClass({
           { formDataSections: newFormDataSections },
           true,
         ));
       });
     }
   },
 
   componentWillUnmount() {
-    Prefs.filters = this.props.activeFilters;
     this.splitter.removeEventListener("mouseup", this.resize);
     window.removeEventListener("resize", this.resize);
   },
 
   resize() {
     const { dispatch } = this.props;
     // Allow requests to settle down first.
     setNamedTimeout("resize-events", 50, () => {

--- a/devtools/client/netmonitor/middleware/moz.build
+++ b/devtools/client/netmonitor/middleware/moz.build
@@ -1,7 +1,8 @@
 # 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/.
 
 DevToolsModules(
     'batching.js',
+    'prefs.js',
 )

new file mode 100644
--- /dev/null
+++ b/devtools/client/netmonitor/middleware/prefs.js
@@ -0,0 +1,29 @@
+/* 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/. */
+
+"use strict";
+
+const {
+  ENABLE_REQUEST_FILTER_TYPE_ONLY,
+  TOGGLE_REQUEST_FILTER_TYPE,
+} = require("../constants");
+const { Prefs } = require("../prefs");
+const { getActiveFilters } = require("../selectors/index");
+
+/**
+  * Whenever the User clicks on a filter in the network monitor, save the new
+  * filters for future tabs
+  */
+function prefsMiddleware(store) {
+  return next => action => {
+    const res = next(action);
+    if (action.type === ENABLE_REQUEST_FILTER_TYPE_ONLY ||
+        action.type === TOGGLE_REQUEST_FILTER_TYPE) {
+      Prefs.filters = getActiveFilters(store.getState());
+    }
+    return res;
+  };
+}
+
+module.exports = prefsMiddleware;

--- a/devtools/client/netmonitor/store.js
+++ b/devtools/client/netmonitor/store.js
@@ -2,21 +2,23 @@
  * 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/. */
 
 "use strict";
 
 const { createStore, applyMiddleware } = require("devtools/client/shared/vendor/redux");
 const { thunk } = require("devtools/client/shared/redux/middleware/thunk");
 const batching = require("./middleware/batching");
+const prefs = require("./middleware/prefs");
 const rootReducer = require("./reducers/index");
 
 function configureStore() {
   return createStore(
     rootReducer,
     applyMiddleware(
       thunk,
+      prefs,
       batching
     )
   );
 }
 
 exports.configureStore = configureStore;

--- a/devtools/client/netmonitor/test/browser_net_filter-04.js
+++ b/devtools/client/netmonitor/test/browser_net_filter-04.js
@@ -25,33 +25,31 @@ const REQUESTS_WITH_MEDIA_AND_FLASH = RE
 ]);
 
 const REQUESTS_WITH_MEDIA_AND_FLASH_AND_WS = REQUESTS_WITH_MEDIA_AND_FLASH.concat([
   /* "Upgrade" is a reserved header and can not be set on XMLHttpRequest */
   { url: "sjs_content-type-test-server.sjs?fmt=ws" },
 ]);
 
 add_task(function* () {
-  Services.prefs.setCharPref("devtools.netmonitor.filters", '["js", "bogus"]');
+  Services.prefs.setCharPref("devtools.netmonitor.filters", '["bogus", "js", "alsobogus"]');
 
   let { monitor } = yield initNetMonitor(FILTERING_URL);
   info("Starting test... ");
 
   let { gStore, windowRequire } = monitor.panelWin;
   let Actions = windowRequire("devtools/client/netmonitor/actions/index");
   let { Prefs } = windowRequire("devtools/client/netmonitor/prefs");
 
   gStore.dispatch(Actions.batchEnable(false));
 
-  is(Prefs.filters.length, 2,
-    "All filter types were loaded as an array from the preferences.");
+  is(Prefs.filters.length, 1,
+    "Only the valid filter types should be loaded, the others should be ignored");
   is(Prefs.filters[0], "js",
-    "The first filter type is correct.");
-  is(Prefs.filters[1], "bogus",
-    "The second filter type is invalid, but loaded anyway.");
+    "The only filter type is correct.");
 
   let wait = waitForNetworkEvents(monitor, 9);
   loadCommonFrameScript();
   yield performRequestsInContent(REQUESTS_WITH_MEDIA_AND_FLASH_AND_WS);
   yield wait;
 
   testFilterButtons(monitor, "js");
   ok(true, "Only the correct filter type was taken into consideration.");