diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2c0f7a465..ca6334475 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -80,6 +80,7 @@
 - Status: add provider usage snapshots to `/status`, `clawdbot status --usage`, and the macOS menu bar.
 - Build: fix macOS packaging QR smoke test for the bun-compiled relay. Thanks @dbhurley for PR #358.
 - Browser: fix `browser snapshot`/`browser act` timeouts under Bun by patching Playwright’s CDP WebSocket selection. Thanks @azade-c for PR #307.
+- Browser: detect Chrome/Chromium installs on Windows for the browser tool. Thanks @mrdbstn for PR #439.
 - Browser: add `--browser-profile` flag and honor profile in tabs routes + browser tool. Thanks @jamesgroat for PR #324.
 - Gmail: include tailscale command exit codes/output when hook setup fails (easier debugging).
 - Telegram: stop typing after tool results. Thanks @AbhisekBasu1 for PR #322.
diff --git a/src/browser/chrome.test.ts b/src/browser/chrome.test.ts
index ddcea3a7d..5fbeae69f 100644
--- a/src/browser/chrome.test.ts
+++ b/src/browser/chrome.test.ts
@@ -136,6 +136,7 @@ describe("browser chrome profile decoration", () => {
 
 describe("browser chrome helpers", () => {
   afterEach(() => {
+    vi.unstubAllEnvs();
     vi.unstubAllGlobals();
     vi.restoreAllMocks();
   });
@@ -157,6 +158,7 @@ describe("browser chrome helpers", () => {
   });
 
   it("picks the first existing Chrome candidate on Windows", () => {
+    vi.stubEnv("LOCALAPPDATA", "C:\\Users\\Test\\AppData\\Local");
     const exists = vi
       .spyOn(fs, "existsSync")
       .mockImplementation((p) => String(p).includes("Chrome SxS"));
@@ -167,8 +169,7 @@ describe("browser chrome helpers", () => {
   });
 
   it("finds Chrome in Program Files on Windows", () => {
-    // Use path.join to match how the function builds paths (cross-platform)
-    const marker = path.join("Program Files", "Google", "Chrome");
+    const marker = path.win32.join("Program Files", "Google", "Chrome");
     const exists = vi
       .spyOn(fs, "existsSync")
       .mockImplementation((p) => String(p).includes(marker));
diff --git a/src/browser/chrome.ts b/src/browser/chrome.ts
index 9979f803b..f8bf48eb2 100644
--- a/src/browser/chrome.ts
+++ b/src/browser/chrome.ts
@@ -109,57 +109,61 @@ export function findChromeExecutableWindows(): BrowserExecutable | null {
   const programFilesX86 =
     process.env["ProgramFiles(x86)"] ?? "C:\\Program Files (x86)";
 
-  const candidates: Array<BrowserExecutable> = [
+  const joinWin = path.win32.join;
+  const candidates: Array<BrowserExecutable> = [];
+
+  if (localAppData) {
     // Chrome Canary (user install)
-    {
+    candidates.push({
       kind: "canary",
-      path: path.join(
+      path: joinWin(
         localAppData,
         "Google",
         "Chrome SxS",
         "Application",
         "chrome.exe",
       ),
-    },
+    });
     // Chromium (user install)
-    {
+    candidates.push({
       kind: "chromium",
-      path: path.join(localAppData, "Chromium", "Application", "chrome.exe"),
-    },
+      path: joinWin(localAppData, "Chromium", "Application", "chrome.exe"),
+    });
     // Chrome (user install)
-    {
+    candidates.push({
       kind: "chrome",
-      path: path.join(
+      path: joinWin(
         localAppData,
         "Google",
         "Chrome",
         "Application",
         "chrome.exe",
       ),
-    },
-    // Chrome (system install, 64-bit)
-    {
-      kind: "chrome",
-      path: path.join(
-        programFiles,
-        "Google",
-        "Chrome",
-        "Application",
-        "chrome.exe",
-      ),
-    },
-    // Chrome (system install, 32-bit on 64-bit Windows)
-    {
-      kind: "chrome",
-      path: path.join(
-        programFilesX86,
-        "Google",
-        "Chrome",
-        "Application",
-        "chrome.exe",
-      ),
-    },
-  ];
+    });
+  }
+
+  // Chrome (system install, 64-bit)
+  candidates.push({
+    kind: "chrome",
+    path: joinWin(
+      programFiles,
+      "Google",
+      "Chrome",
+      "Application",
+      "chrome.exe",
+    ),
+  });
+  // Chrome (system install, 32-bit on 64-bit Windows)
+  candidates.push({
+    kind: "chrome",
+    path: joinWin(
+      programFilesX86,
+      "Google",
+      "Chrome",
+      "Application",
+      "chrome.exe",
+    ),
+  });
 
   for (const candidate of candidates) {
     if (exists(candidate.path)) return candidate;