diff --git a/app/NativeMacReceiverSelector/AppDelegate.swift b/app/NativeMacReceiverSelector/AppDelegate.swift
index aa2e50c..f461cff 100644
--- a/app/NativeMacReceiverSelector/AppDelegate.swift
+++ b/app/NativeMacReceiverSelector/AppDelegate.swift
@@ -2,21 +2,47 @@ import Cocoa
 
 
 class AppDelegate : NSObject, NSApplicationDelegate {
+    var initData: InitData!
+
     var mainWindow: NSWindow?
     var mainWindowController: NSWindowController?
     var mainWindowViewController: ViewController?
 
 
     func applicationDidFinishLaunching (_ aNotification: Notification) {
+        if (CommandLine.argc < 2) {
+            fputs("Error: Not enough args\n", stderr)
+            exit(1)
+        }
+
+        guard let data = CommandLine.arguments[1].data(using: .utf8) else {
+            fputs("Error: Failed to convert input to data\n", stderr)
+            exit(1)
+        }
+
+        do {
+            // Decode and store initialization JSON data
+            self.initData = try JSONDecoder().decode(InitData.self, from: data)
+        } catch {
+            fputs("Error: Failed to parse input data\n", stderr)
+            exit(1)
+        }
+
+
         let window = NSWindow(
                 contentRect: NSZeroRect
               , styleMask: [ .titled, .closable ]
               , backing: .buffered
               , defer: false)
 
+        let screenHeight = NSScreen.main!.frame.height
+
         window.titleVisibility = .hidden
+        window.isMovableByWindowBackground = true
         window.orderFrontRegardless()
-        window.center()
+        window.setFrameTopLeftPoint(NSPoint(
+                x: self.initData.windowPositionX
+              , y: Int(screenHeight - CGFloat(self.initData.windowPositionY))))
 
         let windowController = NSWindowController(window: window)
         windowController.showWindow(window)
diff --git a/app/NativeMacReceiverSelector/ViewController.swift b/app/NativeMacReceiverSelector/ViewController.swift
index a09dd30..6512102 100644
--- a/app/NativeMacReceiverSelector/ViewController.swift
+++ b/app/NativeMacReceiverSelector/ViewController.swift
@@ -21,24 +21,7 @@ class ViewController : NSViewController {
     override func viewDidLoad () {
         super.viewDidLoad()
 
-        if (CommandLine.argc < 2) {
-            fputs("Error: Not enough args\n", stderr)
-            exit(1)
-        }
-
-        guard let data = CommandLine.arguments[1].data(using: .utf8) else {
-            fputs("Error: Failed to convert input to data\n", stderr)
-            exit(1)
-        }
-
-        do {
-            // Decode and store initialization JSON data
-            self.initData = try JSONDecoder().decode(InitData.self, from: data)
-        } catch {
-            fputs("Error: Failed to parse input data\n", stderr)
-            exit(1)
-        }
-
+        self.initData = (NSApplication.shared.delegate as! AppDelegate).initData
 
         /**
          * View Hierarchy
diff --git a/app/NativeMacReceiverSelector/models/InitData.swift b/app/NativeMacReceiverSelector/models/InitData.swift
index 647aad7..7bec638 100644
--- a/app/NativeMacReceiverSelector/models/InitData.swift
+++ b/app/NativeMacReceiverSelector/models/InitData.swift
@@ -3,6 +3,9 @@ struct InitData : Codable {
     let defaultMediaType: MediaType
     let availableMediaTypes: Int
 
+    let windowPositionX: Int
+    let windowPositionY: Int
+
     let i18n_extensionName: String
     let i18n_castButtonTitle: String
     let i18n_mediaTypeApp: String
diff --git a/ext/src/receiver_selectors/NativeMacReceiverSelector.ts b/ext/src/receiver_selectors/NativeMacReceiverSelector.ts
index c6bc071..488cd65 100644
--- a/ext/src/receiver_selectors/NativeMacReceiverSelector.ts
+++ b/ext/src/receiver_selectors/NativeMacReceiverSelector.ts
@@ -6,6 +6,7 @@ import options from "../lib/options";
 import ReceiverSelector, {
         ReceiverSelectorMediaType } from "./ReceiverSelector";
 
+import { getWindowCenteredProps } from "../lib/utils";
 import { Message, Receiver } from "../types";
 
 import { NativeReceiverSelectorCloseMessage
@@ -58,6 +59,11 @@ export default class NativeMacReceiverSelector
             this.bridgePortDisconnected = true;
         });
 
+
+        // Current window to base centered position on
+        const openerWindow = await browser.windows.getCurrent();
+        const centeredProps = getWindowCenteredProps(openerWindow, 350, 0);
+
         this.bridgePort.postMessage({
             subject: "bridge:/receiverSelector/open"
           , data: JSON.stringify({
@@ -65,6 +71,9 @@ export default class NativeMacReceiverSelector
               , defaultMediaType
               , availableMediaTypes
 
+              , windowPositionX: centeredProps.left
+              , windowPositionY: centeredProps.top
+
               , i18n_extensionName: _("extensionName")
               , i18n_castButtonTitle: _("popupCastButtonTitle")
               , i18n_mediaTypeApp: _("popupMediaTypeApp")