diff --git a/dom/apps/Webapps.jsm b/dom/apps/Webapps.jsm
index e344d9b0c1d2..a9771e663f24 100644
--- a/dom/apps/Webapps.jsm
+++ b/dom/apps/Webapps.jsm
@@ -2547,8 +2547,7 @@ this.DOMApplicationRegistry = {
 
       // Disallow reinstalls from the same manifest url for now.
       for (let id in this.webapps) {
-        if (this.webapps[id].manifestURL == app.manifestURL &&
-            this._isLaunchable(this.webapps[id])) {
+        if (this.webapps[id].manifestURL == app.manifestURL) {
           sendError("REINSTALL_FORBIDDEN");
           return false;
         }
@@ -2679,7 +2678,7 @@ this.DOMApplicationRegistry = {
 
       // Disallow reinstalls from the same manifest URL for now.
       let id = this._appIdForManifestURL(app.manifestURL);
-      if (id !== null && this._isLaunchable(this.webapps[id])) {
+      if (id !== null) {
         sendError("REINSTALL_FORBIDDEN");
         return false;
       }
@@ -3141,13 +3140,7 @@ this.DOMApplicationRegistry = {
     if (!aData.isPackage) {
       this.updateAppHandlers(null, app.manifest, app);
       if (aInstallSuccessCallback) {
-        try {
-          yield aInstallSuccessCallback(app, app.manifest);
-        } catch (e) {
-          // Ignore exceptions during the local installation of
-          // an app. If it fails, the app will anyway be considered
-          // as not installed because isLaunchable will return false.
-        }
+        yield aInstallSuccessCallback(app, app.manifest);
       }
     }
 
@@ -3237,13 +3230,7 @@ this.DOMApplicationRegistry = {
                          aNewApp.manifestURL, aManifest);
 
     if (aInstallSuccessCallback) {
-      try {
-        yield aInstallSuccessCallback(aNewApp, aManifest, zipFile.path);
-      } catch (e) {
-        // Ignore exceptions during the local installation of
-        // an app. If it fails, the app will anyway be considered
-        // as not installed because isLaunchable will return false.
-      }
+      yield aInstallSuccessCallback(aNewApp, aManifest, zipFile.path);
     }
 
     MessageBroadcaster.broadcastMessage("Webapps:UpdateState", {
@@ -4018,7 +4005,7 @@ this.DOMApplicationRegistry = {
         debug("Setting origin to " + uri.prePath +
               " for " + aOldApp.manifestURL);
         let newId = uri.prePath.substring(6); // "app://".length
-        if (newId in this.webapps && this._isLaunchable(this.webapps[newId])) {
+        if (newId in this.webapps) {
           throw "DUPLICATE_ORIGIN";
         }
         aOldApp.origin = uri.prePath;
@@ -4297,8 +4284,7 @@ this.DOMApplicationRegistry = {
 
     for (let id in this.webapps) {
       if (this.webapps[id].origin == aData.origin &&
-          this.webapps[id].localId == aData.appId &&
-          this._isLaunchable(this.webapps[id])) {
+          this.webapps[id].localId == aData.appId) {
         let app = AppsUtils.cloneAppObject(this.webapps[id]);
         aData.apps.push(app);
         tmp.push({ id: id });
@@ -4323,8 +4309,7 @@ this.DOMApplicationRegistry = {
     let tmp = [];
 
     for (let appId in this.webapps) {
-      if (this.webapps[appId].manifestURL == aData.manifestURL &&
-          this._isLaunchable(this.webapps[appId])) {
+      if (this.webapps[appId].manifestURL == aData.manifestURL) {
         aData.app = AppsUtils.cloneAppObject(this.webapps[appId]);
         tmp.push({ id: appId });
         break;
@@ -4345,8 +4330,7 @@ this.DOMApplicationRegistry = {
     let tmp = [];
 
     for (let id in this.webapps) {
-      if (this.webapps[id].installOrigin == aData.origin &&
-          this._isLaunchable(this.webapps[id])) {
+      if (this.webapps[id].installOrigin == aData.origin) {
         aData.apps.push(AppsUtils.cloneAppObject(this.webapps[id]));
         tmp.push({ id: id });
       }
@@ -4361,20 +4345,7 @@ this.DOMApplicationRegistry = {
 
   getNotInstalled: function(aData, aMm) {
     aData.apps = [];
-    let tmp = [];
-
-    for (let id in this.webapps) {
-      if (!this._isLaunchable(this.webapps[id])) {
-        aData.apps.push(AppsUtils.cloneAppObject(this.webapps[id]));
-        tmp.push({ id: id });
-      }
-    }
-
-    this._readManifests(tmp).then((aResult) => {
-      for (let i = 0; i < aResult.length; i++)
-        aData.apps[i].manifest = aResult[i].manifest;
-      aMm.sendAsyncMessage("Webapps:GetNotInstalled:Return:OK", this.formatMessage(aData));
-    });
+    aMm.sendAsyncMessage("Webapps:GetNotInstalled:Return:OK", this.formatMessage(aData));
   },
 
   getIcon: function(aData, aMm) {
@@ -4803,10 +4774,6 @@ this.DOMApplicationRegistry = {
     }
   },
 
-  _isLaunchable: function(aApp) {
-    return true;
-  },
-
   _notifyCategoryAndObservers: function(subject, topic, data,  msg) {
     const serviceMarker = "service,";