diff --git a/mkdocs-website/docs/en/changelog.md b/mkdocs-website/docs/en/changelog.md
index f33099dc3..d6a1f9366 100644
--- a/mkdocs-website/docs/en/changelog.md
+++ b/mkdocs-website/docs/en/changelog.md
@@ -20,7 +20,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - [darwin] Ensure `windowDidBecomeKey` callback is running on main thread by [@leaanthony](https://github.com/leaanthony)
-
+- Ensure key callbacks in window run() are called on the main thread by [@leaanthony](https://github.com/leaanthony)
 
 ## v3.0.0-alpha.8.3 - 2024-12-07
 
diff --git a/v3/pkg/application/linux_cgo.go b/v3/pkg/application/linux_cgo.go
index 4966769f7..1ef75c668 100644
--- a/v3/pkg/application/linux_cgo.go
+++ b/v3/pkg/application/linux_cgo.go
@@ -826,16 +826,18 @@ func (w *linuxWebviewWindow) enableDND() {
 }
 
 func (w *linuxWebviewWindow) execJS(js string) {
-	value := C.CString(js)
-	C.webkit_web_view_evaluate_javascript(w.webKitWebView(),
-		value,
-		C.long(len(js)),
-		nil,
-		C.CString(""),
-		nil,
-		nil,
-		nil)
-	C.free(unsafe.Pointer(value))
+	InvokeAsync(func() {
+		value := C.CString(js)
+		C.webkit_web_view_evaluate_javascript(w.webKitWebView(),
+			value,
+			C.long(len(js)),
+			nil,
+			C.CString(""),
+			nil,
+			nil,
+			nil)
+		C.free(unsafe.Pointer(value))
+	})
 }
 
 func getMousePosition() (int, int, *Screen) {
@@ -1481,8 +1483,9 @@ func onUriList(extracted **C.char, data unsafe.Pointer) {
 	}
 }
 
-var debounceTimer *time.Timer 
+var debounceTimer *time.Timer
 var isDebouncing bool = false
+
 //export onKeyPressEvent
 func onKeyPressEvent(_ *C.GtkWidget, event *C.GdkEventKey, userData C.uintptr_t) C.gboolean {
 	// Keypress re-emits if the key is pressed over a certain threshold so we need a debounce
diff --git a/v3/pkg/application/webview_window_linux.go b/v3/pkg/application/webview_window_linux.go
index a43ae2e82..a02f2aa47 100644
--- a/v3/pkg/application/webview_window_linux.go
+++ b/v3/pkg/application/webview_window_linux.go
@@ -321,13 +321,15 @@ func (w *linuxWebviewWindow) run() {
 
 	w.setURL(startURL)
 	w.parent.OnWindowEvent(events.Linux.WindowLoadChanged, func(_ *WindowEvent) {
-		if w.parent.options.JS != "" {
-			w.execJS(w.parent.options.JS)
-		}
-		if w.parent.options.CSS != "" {
-			js := fmt.Sprintf("(function() { var style = document.createElement('style'); style.appendChild(document.createTextNode('%s')); document.head.appendChild(style); })();", w.parent.options.CSS)
-			w.execJS(js)
-		}
+		InvokeAsync(func() {
+			if w.parent.options.JS != "" {
+				w.execJS(w.parent.options.JS)
+			}
+			if w.parent.options.CSS != "" {
+				js := fmt.Sprintf("(function() { var style = document.createElement('style'); style.appendChild(document.createTextNode('%s')); document.head.appendChild(style); })();", w.parent.options.CSS)
+				w.execJS(js)
+			}
+		})
 	})
 	w.parent.OnWindowEvent(events.Linux.WindowFocusIn, func(e *WindowEvent) {
 		w.parent.emit(events.Common.WindowFocus)
diff --git a/v3/pkg/application/webview_window_windows.go b/v3/pkg/application/webview_window_windows.go
index c34c1288f..85c32505c 100644
--- a/v3/pkg/application/webview_window_windows.go
+++ b/v3/pkg/application/webview_window_windows.go
@@ -267,7 +267,7 @@ func (w *windowsWebviewWindow) run() {
 		nil)
 
 	if w.hwnd == 0 {
-		panic("Unable to create window")
+		globalApplication.fatal("Unable to create window")
 	}
 
 	// Ensure correct window size in case the scale factor of current screen is different from the initial one.
@@ -329,7 +329,9 @@ func (w *windowsWebviewWindow) run() {
 	case SystemDefault:
 		w.updateTheme(w32.IsCurrentlyDarkMode())
 		w.parent.onApplicationEvent(events.Windows.SystemThemeChanged, func(*ApplicationEvent) {
-			w.updateTheme(w32.IsCurrentlyDarkMode())
+			InvokeAsync(func() {
+				w.updateTheme(w32.IsCurrentlyDarkMode())
+			})
 		})
 	case Light:
 		w.updateTheme(false)
@@ -527,8 +529,7 @@ func (w *windowsWebviewWindow) reload() {
 }
 
 func (w *windowsWebviewWindow) forceReload() {
-	//TODO implement me
-	panic("implement me")
+	// noop
 }
 
 func (w *windowsWebviewWindow) zoomReset() {
@@ -580,8 +581,7 @@ func (w *windowsWebviewWindow) close() {
 }
 
 func (w *windowsWebviewWindow) zoom() {
-	//TODO implement me
-	panic("implement me")
+	// Noop
 }
 
 func (w *windowsWebviewWindow) setHTML(html string) {
@@ -1299,7 +1299,7 @@ func (w *windowsWebviewWindow) setWindowMask(imageData []byte) {
 
 	data, err := pngToImage(imageData)
 	if err != nil {
-		panic(err)
+		globalApplication.fatal("Fatal error in callback setWindowMask: " + err.Error())
 	}
 
 	bitmap, err := w32.CreateHBITMAPFromImage(data)