diff --git a/ext/src/background/ShimManager.ts b/ext/src/background/ShimManager.ts
index 22b4312..f4e4334 100644
--- a/ext/src/background/ShimManager.ts
+++ b/ext/src/background/ShimManager.ts
@@ -156,15 +156,11 @@ export default new class ShimManager {
 
             case "main:/selectReceiverBegin": {
                 const contentTab = await browser.tabs.get(shim.contentTabId);
-                const availableMediaTypes = getMediaTypesForPageUrl(
-                        contentTab.url);
 
                 try {
-                    const selection = await ReceiverSelectorManager
-                            .getSelection(
-                                    ReceiverSelectorMediaType.App
-                                  , availableMediaTypes
-                                  , shim.requestedAppId);
+                    const selection =
+                            await ReceiverSelectorManager.getSelection(
+                                    shim.contentTabId, shim.contentFrameId);
 
                     // Handle cancellation
                     if (!selection) {
diff --git a/ext/src/background/background.ts b/ext/src/background/background.ts
index 24594ca..c093d90 100755
--- a/ext/src/background/background.ts
+++ b/ext/src/background/background.ts
@@ -65,12 +65,7 @@ function initBrowserAction () {
      * top-level frame.
      */
     browser.browserAction.onClicked.addListener(async tab => {
-        const currentShim = ShimManager.getShim(tab.id);
-        const selection = await ReceiverSelectorManager.getSelection(
-                ReceiverSelectorMediaType.Tab
-              , getMediaTypesForPageUrl(tab.url)
-                      & ~ReceiverSelectorMediaType.App
-              , currentShim.requestedAppId);
+        const selection = await ReceiverSelectorManager.getSelection(tab.id);
 
         if (selection) {
             loadSender({
@@ -161,11 +156,8 @@ async function initMenus () {
 
         switch (info.menuItemId) {
             case menuIdMediaCast: {
-                const currentShim = ShimManager.getShim(tab.id, info.frameId);
                 const selection = await ReceiverSelectorManager.getSelection(
-                        ReceiverSelectorMediaType.App
-                      , availableMediaTypes
-                      , currentShim.requestedAppId);
+                        tab.id, info.frameId);
 
                 // Selection cancelled
                 if (!selection) {
@@ -204,11 +196,8 @@ async function initMenus () {
             }
 
             case menuIdMirroringCast: {
-                const currentShim = ShimManager.getShim(tab.id, info.frameId);
                 const selection = await ReceiverSelectorManager.getSelection(
-                        ReceiverSelectorMediaType.Tab
-                      , availableMediaTypes & ~ReceiverSelectorMediaType.App
-                      , currentShim.requestedAppId);
+                        tab.id, info.frameId);
 
                 loadSender({
                     tabId: tab.id
diff --git a/ext/src/background/receiverSelector/ReceiverSelectorManager.ts b/ext/src/background/receiverSelector/ReceiverSelectorManager.ts
index 3071662..1efbb10 100644
--- a/ext/src/background/receiverSelector/ReceiverSelectorManager.ts
+++ b/ext/src/background/receiverSelector/ReceiverSelectorManager.ts
@@ -2,8 +2,11 @@
 
 import options from "../../lib/options";
 
+import ShimManager from "../ShimManager";
 import StatusManager from "../StatusManager";
 
+import { getMediaTypesForPageUrl } from "../../lib/utils";
+
 import { ReceiverSelector
        , ReceiverSelectorType } from "./";
 import { ReceiverSelection
@@ -49,16 +52,50 @@ async function getSelector () {
  *   - Rejects if the selection fails.
  */
 async function getSelection (
-        defaultMediaType =
-                ReceiverSelectorMediaType.Tab
-      , availableMediaTypes =
-                ReceiverSelectorMediaType.Tab
-              | ReceiverSelectorMediaType.Screen
-              | ReceiverSelectorMediaType.File
-      , requestedAppId: string)
+        contextTabId: number
+      , contextFrameId = 0)
         : Promise<ReceiverSelection> {
 
     return new Promise(async (resolve, reject) => {
+        const currentShim = ShimManager.getShim(
+                contextTabId, contextFrameId);
+
+        let defaultMediaType = ReceiverSelectorMediaType.Tab;
+        let availableMediaTypes;
+
+        try {
+            const { url } = await browser.webNavigation.getFrame({
+                tabId: contextTabId
+              , frameId: contextFrameId
+            });
+
+            availableMediaTypes = getMediaTypesForPageUrl(url);
+        } catch (err) {
+            console.error("fx_cast (Debug): Failed to locate frame");
+            reject();
+            return;
+        }
+
+        // Enable app media type if initialized sender app is found
+        if (currentShim) {
+            defaultMediaType = ReceiverSelectorMediaType.App;
+            availableMediaTypes |= ReceiverSelectorMediaType.App;
+        }
+
+        const opts = await options.getAll();
+
+        // Remove mirroring media types if mirroring is not enabled
+        if (!opts.mirroringEnabled) {
+            availableMediaTypes &= ~(
+                    ReceiverSelectorMediaType.Tab
+                  | ReceiverSelectorMediaType.Screen);
+        }
+
+        // Remove file media type if local media is not enabled
+        if (!opts.mediaEnabled || !opts.localMediaEnabled) {
+            availableMediaTypes &= ~ReceiverSelectorMediaType.File;
+        }
+
 
         // Close an existing open selector
         if (sharedSelector && sharedSelector.isOpen) {
@@ -84,21 +121,6 @@ async function getSelection (
         });
 
 
-        const opts = await options.getAll();
-
-        // Remove mirroring media types if mirroring is not enabled.
-        if (!opts.mirroringEnabled) {
-            availableMediaTypes &= ~(
-                    ReceiverSelectorMediaType.Tab
-                  | ReceiverSelectorMediaType.Screen);
-        }
-
-        // Remove file media type if local media is not enabled
-        if (!opts.mediaEnabled || !opts.localMediaEnabled) {
-            availableMediaTypes &= ~ReceiverSelectorMediaType.File;
-        }
-
-
         // Ensure status manager is initialized
         await StatusManager.init();
 
@@ -106,7 +128,7 @@ async function getSelection (
                 Array.from(StatusManager.getReceivers())
               , defaultMediaType
               , availableMediaTypes
-              , requestedAppId);
+              , currentShim?.requestedAppId);
     });
 }
 
diff --git a/ext/src/lib/utils.ts b/ext/src/lib/utils.ts
index c075c77..f2ecccd 100644
--- a/ext/src/lib/utils.ts
+++ b/ext/src/lib/utils.ts
@@ -63,9 +63,7 @@ export function getMediaTypesForPageUrl (
 
     // Only meant to run on normal web pages
     if (url.protocol === "http:" || url.protocol === "https:") {
-        availableMediaTypes |= (
-                ReceiverSelectorMediaType.App
-              | ReceiverSelectorMediaType.Tab);
+        availableMediaTypes |= ReceiverSelectorMediaType.Tab;
     }
 
     /**