diff --git a/.gitignore b/.gitignore
deleted file mode 100644
index 8dea263..0000000
--- a/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-/dist/
-.amo-upload-uuid
\ No newline at end of file
diff --git a/background.js b/background.js
index e1c7b56..b2a85d4 100644
--- a/background.js
+++ b/background.js
@@ -1,73 +1,18 @@
 "use strict";
 
-const CHROME_VERSION = "140.0.0.0";
-const TARGET_HOSTS = [
-  "netflix.com",
-  "assets.nflxext.com"
-];
+const WINDOWS_CHROME_UA =
+  "Mozilla/5.0 (Windows NT 10.0; Win64; x64) " +
+  "AppleWebKit/537.36 (KHTML, like Gecko) " +
+  "Chrome/140.0.0.0 Safari/537.36";
 
-function getOperatingSystem() {
-  const ua = globalThis.navigator?.userAgent || "";
-  const platform = globalThis.navigator?.platform || "";
-  const userAgentDataPlatform = globalThis.navigator?.userAgentData?.platform || "";
-
-  if (/Windows/i.test(ua) || /Win/i.test(platform) || /win/i.test(userAgentDataPlatform)) {
-    return "win";
-  }
-
-  if (/Mac/i.test(ua) || /Mac/i.test(platform) || /mac/i.test(userAgentDataPlatform)) {
-    return "mac";
-  }
-
-  if (/Linux/i.test(ua) || /Linux/i.test(platform) || /linux/i.test(userAgentDataPlatform)) {
-    return "linux";
-  }
-
-  return "linux";
-}
-
-function getChromeLikeUserAgent() {
-  const os = getOperatingSystem();
-
-  switch (os) {
-    case "mac":
-      return `Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/${CHROME_VERSION} Safari/537.36`;
-    case "win":
-      return `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/${CHROME_VERSION} Safari/537.36`;
-    case "linux":
-    default:
-      return `Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/${CHROME_VERSION} Safari/537.36`;
-  }
-}
-
-function isTargetHost(url) {
-  try {
-    const hostname = new URL(url).hostname.toLowerCase();
-
-    return hostname === "netflix.com" ||
-      hostname.endsWith(".netflix.com") ||
-      hostname === "assets.nflxext.com" ||
-      hostname.endsWith(".nflxext.com");
-  } catch {
-    return false;
-  }
-}
-
-const browserApi = globalThis.browser || globalThis.chrome;
-
-browserApi.webRequest.onBeforeSendHeaders.addListener(
+browser.webRequest.onBeforeSendHeaders.addListener(
   (details) => {
-    if (!isTargetHost(details.url)) {
-      return {};
-    }
-
     const requestHeaders = details.requestHeaders ?? [];
-    const userAgentValue = getChromeLikeUserAgent();
     let foundUserAgent = false;
 
     for (const header of requestHeaders) {
       if (header.name.toLowerCase() === "user-agent") {
-        header.value = userAgentValue;
+        header.value = WINDOWS_CHROME_UA;
         foundUserAgent = true;
         break;
       }
@@ -76,7 +21,7 @@ browserApi.webRequest.onBeforeSendHeaders.addListener(
     if (!foundUserAgent) {
       requestHeaders.push({
         name: "User-Agent",
-        value: userAgentValue
+        value: WINDOWS_CHROME_UA
       });
     }
 
@@ -85,9 +30,7 @@ browserApi.webRequest.onBeforeSendHeaders.addListener(
   {
     urls: [
       "*://netflix.com/*",
-      "*://*.netflix.com/*",
-      "*://assets.nflxext.com/*",
-      "*://*.nflxext.com/*"
+      "*://*.netflix.com/*"
     ]
   },
   [
diff --git a/manifest.json b/manifest.json
index 2aa77c5..033612b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,8 +1,8 @@
 {
   "manifest_version": 3,
-  "name": "thisischromiumnetflix",
-  "version": "2026.7.27.1",
-  "description": "Netflix 관련 요청의 User-Agent를 운영체제에 맞춰 조정합니다.",
+  "name": "thisiswindowschromiumnetflix",
+  "version": "1.0.0",
+  "description": "Netflix에서 User-Agent를 Windows Chrome으로 고정합니다.",
 
   "permissions": [
     "webRequest",
@@ -23,7 +23,7 @@
   "browser_specific_settings": {
     "gecko": {
       "id": "thisiswindowschromiumnetflix@imnya.ng",
-      "strict_min_version": "142.0",
+      "strict_min_version": "109.0",
       "data_collection_permissions": {
         "required": [
           "none"
@@ -31,4 +31,4 @@
       }
     }
   }
-}
+}
\ No newline at end of file