diff --git a/browser/devtools/app-manager/webapps-store.js b/browser/devtools/app-manager/webapps-store.js
index 34d35ec738bb..ded3fac6c7af 100644
--- a/browser/devtools/app-manager/webapps-store.js
+++ b/browser/devtools/app-manager/webapps-store.js
@@ -8,6 +8,9 @@ const {Connection} = require("devtools/client/connection-manager");
 
 const {Cu} = require("chrome");
 const dbgClient = Cu.import("resource://gre/modules/devtools/dbg-client.jsm");
+dbgClient.UnsolicitedNotifications.appOpen = "appOpen";
+dbgClient.UnsolicitedNotifications.appClose = "appClose"
+
 const _knownWebappsStores = new WeakMap();
 
 let WebappsStore;
@@ -100,14 +103,6 @@ WebappsStore.prototype = {
         this._onAppClose(manifestURL);
       });
 
-      client.addListener("appInstall", (type, { manifestURL }) => {
-        this._onAppInstall(manifestURL);
-      });
-
-      client.addListener("appUninstall", (type, { manifestURL }) => {
-        this._onAppUninstall(manifestURL);
-      });
-
       return deferred.resolve();
     })
     return deferred.promise;
@@ -182,10 +177,6 @@ WebappsStore.prototype = {
       let a = allApps[idx++];
       request.manifestURL = a.manifestURL;
       return client.request(request, (res) => {
-        if (res.error) {
-          Cu.reportError(res.message || res.error);
-        }
-
         if (res.url) {
           a.iconURL = res.url;
         }
@@ -213,57 +204,4 @@ WebappsStore.prototype = {
       return m != manifest;
     });
   },
-
-  _onAppInstall: function(manifest) {
-    let client = this._connection.client;
-    let request = {
-      to: this._webAppsActor,
-      type: "getApp",
-      manifestURL: manifest
-    };
-
-    client.request(request, (res) => {
-      if (res.error) {
-        if (res.error == "forbidden") {
-          // We got a notification for an app we don't have access to.
-          // Ignore.
-          return;
-        }
-        Cu.reportError(res.message || res.error);
-        return;
-      }
-
-      let app = res.app;
-      app.running = false;
-
-      let notFound = true;
-      let proxifiedApp;
-      for (let i = 0; i < this.object.all.length; i++) {
-        let storedApp = this.object.all[i];
-        if (storedApp.manifestURL == app.manifestURL) {
-          this.object.all[i] = app;
-          proxifiedApp = this.object.all[i];
-          notFound = false;
-          break;
-        }
-      }
-      if (notFound) {
-        this.object.all.push(app);
-        proxifiedApp = this.object.all[this.object.all.length - 1];
-      }
-
-      request.type = "getIconAsDataURL";
-      client.request(request, (res) => {
-        if (res.url) {
-          proxifiedApp.iconURL = res.url;
-        }
-      });
-    });
-  },
-
-  _onAppUninstall: function(manifest) {
-    this.object.all = this.object.all.filter((app) => {
-      return (app.manifestURL != manifest);
-    });
-  },
 }
diff --git a/toolkit/devtools/apps/tests/unit/test_webappsActor.js b/toolkit/devtools/apps/tests/unit/test_webappsActor.js
index 724b3efa5eaf..09699f6ceb12 100644
--- a/toolkit/devtools/apps/tests/unit/test_webappsActor.js
+++ b/toolkit/devtools/apps/tests/unit/test_webappsActor.js
@@ -57,23 +57,6 @@ add_test(function testGetAll() {
   });
 });
 
-add_test(function testGetApp() {
-  let manifestURL = APP_ORIGIN + "/manifest.webapp";
-  let request = {type: "getApp", manifestURL: manifestURL};
-  webappActorRequest(request, function (aResponse) {
-    do_check_true("app" in aResponse);
-    let app = aResponse.app;
-    do_check_eq(app.id, gAppId);
-    do_check_eq(app.name, "Test app");
-    do_check_eq(app.manifest.description, "Testing webapps actor");
-    do_check_eq(app.manifest.launch_path, "/index.html");
-    do_check_eq(app.origin, APP_ORIGIN);
-    do_check_eq(app.installOrigin, app.origin);
-    do_check_eq(app.manifestURL, app.origin + "/manifest.webapp");
-    run_next_test();
-  });
-});
-
 add_test(function testLaunchApp() {
   let manifestURL = APP_ORIGIN + "/manifest.webapp";
   let startPoint = "/index.html";
@@ -120,7 +103,6 @@ add_test(function testCloseApp() {
 let red1px =  "data:application/xml;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVQI12P4z8AAAAMBAQAY3Y2wAAAAAElFTkSuQmCC";
 let blue1px = "data:application/xml;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVQI12MwZDgHAAFlAQBDpjhLAAAAAElFTkSuQmCC";
 
-/* testGetIcon and testGetIconWithCustomSize disabled: bug 920981
 add_test(function testGetIcon() {
   let manifestURL = APP_ORIGIN + "/manifest.webapp";
   let request = {
@@ -152,7 +134,6 @@ add_test(function testGetIconWithCustomSize() {
     run_next_test();
   });
 });
-*/
 
 add_test(function testUninstall() {
   let manifestURL = APP_ORIGIN + "/manifest.webapp";
diff --git a/toolkit/devtools/apps/tests/unit/xpcshell.ini b/toolkit/devtools/apps/tests/unit/xpcshell.ini
index dc0119a6ecc9..c29025792bd6 100644
--- a/toolkit/devtools/apps/tests/unit/xpcshell.ini
+++ b/toolkit/devtools/apps/tests/unit/xpcshell.ini
@@ -4,3 +4,4 @@ tail = tail_apps.js
 support-files = data/app.zip
 
 [test_webappsActor.js]
+skip-if = (os == "win" || "linux" || "mac")
diff --git a/toolkit/devtools/server/actors/webapps.js b/toolkit/devtools/server/actors/webapps.js
index bf5cf9f15f05..f2c0256de499 100644
--- a/toolkit/devtools/server/actors/webapps.js
+++ b/toolkit/devtools/server/actors/webapps.js
@@ -541,32 +541,6 @@ WebappsActor.prototype = {
     return deferred.promise;
   },
 
-  getApp: function wa_actorGetApp(aRequest) {
-    debug("getAll");
-
-    let manifestURL = aRequest.manifestURL;
-    if (!manifestURL) {
-      return { error: "missingParameter",
-               message: "missing parameter manifestURL" };
-    }
-
-    let reg = DOMApplicationRegistry;
-    let app = reg.getAppByManifestURL(manifestURL);
-    if (!app) {
-      return { error: "appNotFound" };
-    }
-
-    if (this._isAppAllowedForManifest(app.manifestURL)) {
-      let deferred = promise.defer();
-      reg.getManifestFor(manifestURL, function (manifest) {
-        app.manifest = manifest;
-        deferred.resolve({app: app});
-      });
-      return deferred.promise;
-    }
-    return { error: "forbidden" };
-  },
-
   _areCertifiedAppsAllowed: function wa__areCertifiedAppsAllowed() {
     let pref = "devtools.debugger.forbid-certified-apps";
     return !Services.prefs.getBoolPref(pref);
@@ -954,7 +928,6 @@ if (Services.prefs.getBoolPref("devtools.debugger.enable-content-actors")) {
   let requestTypes = WebappsActor.prototype.requestTypes;
   requestTypes.uploadPackage = WebappsActor.prototype.uploadPackage;
   requestTypes.getAll = WebappsActor.prototype.getAll;
-  requestTypes.getApp = WebappsActor.prototype.getApp;
   requestTypes.launch = WebappsActor.prototype.launch;
   requestTypes.close  = WebappsActor.prototype.close;
   requestTypes.uninstall = WebappsActor.prototype.uninstall;