Add an icon! (Credits: LMLocalizer on Reddit) https://www.reddit.com/r/Oobabooga/comments/1tffhcu/comment/omcwa31/

desktop/main.js

@@ -42,6 +42,10 @@ function resolveUserDataDir() {
 }
 const stateFile = path.join(resolveUserDataDir(), "cache", "window-state.json");
 
+// css/ sits next to main.js in portable builds, one level up in dev.
+const portableIcon = path.join(baseDir, "css", "icon.png");
+const iconPath = fs.existsSync(portableIcon) ? portableIcon : path.join(baseDir, "..", "css", "icon.png");
+
 let serverProcess = null;
 let mainWindow = null;
 let portCheckInterval = null;
@@ -110,6 +114,7 @@ function createWindow(port) {
   mainWindow = new BrowserWindow({
     ...bounds,
     title: TITLE,
+    icon: iconPath,
     autoHideMenuBar: true,
     webPreferences: {
       preload: path.join(__dirname, "preload.js"),

server.py

@@ -242,6 +242,7 @@ def create_interface():
         ssl_certfile=shared.args.ssl_certfile,
         root_path=shared.args.subpath,
         allowed_paths=allowed_paths,
+        favicon_path='css/icon.png',
     )