diff --git a/apps/macos/Tests/ClawdbotIPCTests/TalkAudioPlayerTests.swift b/apps/macos/Tests/ClawdbotIPCTests/TalkAudioPlayerTests.swift
index a42f5616f..d010725fc 100644
--- a/apps/macos/Tests/ClawdbotIPCTests/TalkAudioPlayerTests.swift
+++ b/apps/macos/Tests/ClawdbotIPCTests/TalkAudioPlayerTests.swift
@@ -8,7 +8,7 @@ import Testing
         let wav = makeWav16Mono(sampleRate: 8000, samples: 80)
         defer { _ = TalkAudioPlayer.shared.stop() }
 
-        _ = try await withTimeout(seconds: 2.0) {
+        _ = try await withTimeout(seconds: 4.0) {
             await TalkAudioPlayer.shared.play(data: wav)
         }
 
@@ -27,7 +27,7 @@ import Testing
         await Task.yield()
         _ = await TalkAudioPlayer.shared.play(data: wav)
 
-        _ = try await withTimeout(seconds: 2.0) {
+        _ = try await withTimeout(seconds: 4.0) {
             await first.value
         }
         #expect(true)
diff --git a/src/browser/chrome.default-browser.test.ts b/src/browser/chrome.default-browser.test.ts
index 04c7631b1..cfa1e2167 100644
--- a/src/browser/chrome.default-browser.test.ts
+++ b/src/browser/chrome.default-browser.test.ts
@@ -24,10 +24,10 @@ describe("browser default executable detection", () => {
   it("prefers default Chromium browser on macOS", async () => {
     vi.mocked(execFileSync).mockImplementation((cmd, args) => {
       const argsStr = Array.isArray(args) ? args.join(" ") : "";
-      if (cmd === "/usr/bin/osascript" && argsStr.includes("id of application")) {
-        return "com.google.Chrome";
+      if (cmd === "/usr/bin/plutil" && argsStr.includes("LSHandlers")) {
+        return JSON.stringify([{ LSHandlerURLScheme: "http", LSHandlerRoleAll: "com.google.Chrome" }]);
       }
-      if (cmd === "/usr/bin/osascript" && argsStr.includes("POSIX path")) {
+      if (cmd === "/usr/bin/osascript" && argsStr.includes("path to application id")) {
         return "/Applications/Google Chrome.app";
       }
       if (cmd === "/usr/bin/defaults") {
@@ -35,9 +35,11 @@ describe("browser default executable detection", () => {
       }
       return "";
     });
-    vi.mocked(fs.existsSync).mockImplementation((p) =>
-      String(p).includes("/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"),
-    );
+    vi.mocked(fs.existsSync).mockImplementation((p) => {
+      const value = String(p);
+      if (value.includes("com.apple.launchservices.secure.plist")) return true;
+      return value.includes("/Applications/Google Chrome.app/Contents/MacOS/Google Chrome");
+    });
 
     const { resolveBrowserExecutableForPlatform } = await import("./chrome.executables.js");
     const exe = resolveBrowserExecutableForPlatform(
@@ -52,14 +54,16 @@ describe("browser default executable detection", () => {
   it("falls back when default browser is non-Chromium on macOS", async () => {
     vi.mocked(execFileSync).mockImplementation((cmd, args) => {
       const argsStr = Array.isArray(args) ? args.join(" ") : "";
-      if (cmd === "/usr/bin/osascript" && argsStr.includes("id of application")) {
-        return "com.apple.Safari";
+      if (cmd === "/usr/bin/plutil" && argsStr.includes("LSHandlers")) {
+        return JSON.stringify([{ LSHandlerURLScheme: "http", LSHandlerRoleAll: "com.apple.Safari" }]);
       }
       return "";
     });
-    vi.mocked(fs.existsSync).mockImplementation((p) =>
-      String(p).includes("Google Chrome.app/Contents/MacOS/Google Chrome"),
-    );
+    vi.mocked(fs.existsSync).mockImplementation((p) => {
+      const value = String(p);
+      if (value.includes("com.apple.launchservices.secure.plist")) return true;
+      return value.includes("Google Chrome.app/Contents/MacOS/Google Chrome");
+    });
 
     const { resolveBrowserExecutableForPlatform } = await import("./chrome.executables.js");
     const exe = resolveBrowserExecutableForPlatform(
diff --git a/src/browser/chrome.executables.ts b/src/browser/chrome.executables.ts
index de130bcf1..ddd863520 100644
--- a/src/browser/chrome.executables.ts
+++ b/src/browser/chrome.executables.ts
@@ -95,12 +95,17 @@ function exists(filePath: string) {
   }
 }
 
-function execText(command: string, args: string[], timeoutMs = 1200): string | null {
+function execText(
+  command: string,
+  args: string[],
+  timeoutMs = 1200,
+  maxBuffer = 1024 * 1024,
+): string | null {
   try {
     const output = execFileSync(command, args, {
       timeout: timeoutMs,
       encoding: "utf8",
-      maxBuffer: 1024 * 1024,
+      maxBuffer,
     });
     return String(output ?? "").trim() || null;
   } catch {
@@ -140,14 +145,12 @@ function detectDefaultChromiumExecutable(
 }
 
 function detectDefaultChromiumExecutableMac(): BrowserExecutable | null {
-  const bundleId = execText("/usr/bin/osascript", [
-    "-e",
-    'id of application (path to default application for URL "http://example.com")',
-  ]);
-  if (!bundleId || !CHROMIUM_BUNDLE_IDS.has(bundleId.trim())) return null;
+  const bundleId = detectDefaultBrowserBundleIdMac();
+  if (!bundleId || !CHROMIUM_BUNDLE_IDS.has(bundleId)) return null;
+
   const appPathRaw = execText("/usr/bin/osascript", [
     "-e",
-    'POSIX path of (path to default application for URL "http://example.com")',
+    `POSIX path of (path to application id "${bundleId}")`,
   ]);
   if (!appPathRaw) return null;
   const appPath = appPathRaw.trim().replace(/\/$/, "");
@@ -162,6 +165,45 @@ function detectDefaultChromiumExecutableMac(): BrowserExecutable | null {
   return { kind: inferKindFromIdentifier(bundleId), path: exePath };
 }
 
+function detectDefaultBrowserBundleIdMac(): string | null {
+  const plistPath = path.join(
+    os.homedir(),
+    "Library/Preferences/com.apple.LaunchServices/com.apple.launchservices.secure.plist",
+  );
+  if (!exists(plistPath)) return null;
+  const handlersRaw = execText(
+    "/usr/bin/plutil",
+    ["-extract", "LSHandlers", "json", "-o", "-", "--", plistPath],
+    2000,
+    5 * 1024 * 1024,
+  );
+  if (!handlersRaw) return null;
+  let handlers: unknown;
+  try {
+    handlers = JSON.parse(handlersRaw);
+  } catch {
+    return null;
+  }
+  if (!Array.isArray(handlers)) return null;
+
+  const resolveScheme = (scheme: string) => {
+    let candidate: string | null = null;
+    for (const entry of handlers) {
+      if (!entry || typeof entry !== "object") continue;
+      const record = entry as Record<string, unknown>;
+      if (record.LSHandlerURLScheme !== scheme) continue;
+      const role =
+        (typeof record.LSHandlerRoleAll === "string" && record.LSHandlerRoleAll) ||
+        (typeof record.LSHandlerRoleViewer === "string" && record.LSHandlerRoleViewer) ||
+        null;
+      if (role) candidate = role;
+    }
+    return candidate;
+  };
+
+  return resolveScheme("http") ?? resolveScheme("https");
+}
+
 function detectDefaultChromiumExecutableLinux(): BrowserExecutable | null {
   const desktopId =
     execText("xdg-settings", ["get", "default-web-browser"]) ||