Customize user agent to hide Electron branding

Introduces a custom Chrome-compatible user agent string that omits the Electron token and appends a Nebula marker for improved site compatibility and reduced Electron detection. Adds debug mode to optionally reveal Electron in the UA for troubleshooting, and updates session configuration to consistently apply the new user agent.

main.js

@@ -18,6 +18,33 @@ gpuConfig.configure();
 // Set a custom application name
 app.setName('Nebula');
 
+// --- Custom User Agent (hide Electron token & brand as Nebula) ---
+// Many sites rely on UA sniffing. Default Electron UA contains 'Electron/x.y.z' which
+// makes detection sites label the app as an Electron application. We construct a
+// Chrome‑compatible UA string without the Electron token, appending a Nebula marker.
+// NOTE: Keep the Chrome and Safari tokens for maximum compatibility.
+// If you ever need to temporarily reveal Electron for debugging, set NEBULA_DEBUG_ELECTRON_UA=1.
+const chromeVersion = process.versions.chrome; // matches bundled Chromium
+const nebulaVersion = app.getVersion();
+function computeBaseUA() {
+  let platformPart;
+  if (process.platform === 'win32') {
+    // Use generic Windows 10 token; detailed build numbers rarely needed and can cause UA entropy issues.
+    platformPart = 'Windows NT 10.0; Win64; x64';
+  } else if (process.platform === 'darwin') {
+    // A neutral modern macOS token; avoid exposing real minor version for stability.
+    platformPart = 'Macintosh; Intel Mac OS X 10_15_7';
+  } else {
+    platformPart = 'X11; Linux x86_64';
+  }
+  return `Mozilla/5.0 (${platformPart}) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/${chromeVersion} Safari/537.36 Nebula/${nebulaVersion}`;
+}
+
+if (!process.env.NEBULA_DEBUG_ELECTRON_UA) {
+  // Set a fallback UA so any new sessions inherit it automatically.
+  try { app.userAgentFallback = computeBaseUA(); } catch {}
+}
+
 // Setup GPU crash handling
 gpuFallback.setupCrashHandling();
 
@@ -196,9 +223,19 @@ function configureSessionsAsync() {
         }
       });
       try {
-        const realUA = ses.getUserAgent();
-        if (realUA && !realUA.includes('Nebula/')) {
-          ses.setUserAgent(realUA + ' Nebula/1.0.0');
+        let realUA = ses.getUserAgent();
+        // If Electron token present and we're not in debug mode, recompute using base builder.
+        if (!process.env.NEBULA_DEBUG_ELECTRON_UA) {
+          const hasElectron = /Electron\//i.test(realUA);
+          if (hasElectron || !/Nebula\//.test(realUA)) {
+            realUA = app.userAgentFallback || computeBaseUA();
+            ses.setUserAgent(realUA);
+          }
+        } else {
+          // Debug mode: just append Nebula tag if missing (keeps Electron segment visible)
+            if (realUA && !/Nebula\//.test(realUA)) {
+              ses.setUserAgent(realUA + ' Nebula/' + app.getVersion());
+            }
         }
       } catch (e) {
         console.warn('Failed to read real user agent, keeping default:', e);

site-history.json

@@ -1 +1,4 @@
-[]
+[
+  "https://www.whatismybrowser.com/",
+  "https://www.google.com/search?q=what%20is%20my%20browser"
+]