Analyze and review the latest codes you have sent me then make it better and more robust accordingly. 
Make it extremely customisable through popup window. Improve it further. 
Don't add logging. Show only the necessary errors or log through popup window. 
Don't cache unti specified in the request. 
Make sure that the user can customize it thoroughly from popup window without any issue. 
Consider everything. 
Do whatever you can to make this extension work in practical or real world scenarios flawlessly. 
Do whatever you want I just want the ultimate or outmost quality practical extension you could make considering everything and I mean it.
Do whatever you can to make this extension practically feasible not just theoretically.
Give your best or out most.
Send the full working full codes.

---

manifest.json
This file defines the extension's metadata, permissions, background scripts, content scripts, and resources.


{
  "manifest_version": 3,
  "name": "Enhanced CORS Bypass Proxy",
  "version": "2.0",
  "description": "A secure Chrome extension to bypass CORS restrictions with enhanced security and reliability.",
  "permissions": [
    "storage",
    "scripting",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": ["<all_urls>"],
      "js": ["content.js"],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": ["inject.js"],
      "matches": ["<all_urls>"]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "128": "icons/icon128.png",
    "16-disabled": "icons/icon16-disabled.png",
    "32-disabled": "icons/icon32-disabled.png",
    "128-disabled": "icons/icon128-disabled.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "128": "icons/icon128.png"
    },
    "default_popup": "popup.html",
    "default_title": "Enhanced CORS Bypass Proxy"
  }
}

---

// background.js

class ProxyError extends Error {
  constructor(message, status = 500) {
    super(message);
    this.name = 'ProxyError';
    this.status = status;
  }
}

chrome.runtime.onMessage.addListener(async (message, sender, sendResponse) => {
  if (message.type === 'proxy_request') {
    try {
      const { method, url, headers, body, origin } = message.request;

      // Handle preflight requests (OPTIONS)
      if (method.toUpperCase() === 'OPTIONS') {
        sendResponse({
          success: true,
          response: {
            status: 204,
            statusText: 'No Content',
            headers: {
              'access-control-allow-origin': origin,
              'access-control-allow-credentials': 'true',
              'access-control-allow-methods': 'GET, POST, PUT, DELETE, OPTIONS, PATCH',
              'access-control-allow-headers': 'Origin, Content-Type, Accept, Authorization',
              'access-control-max-age': '86400'
            },
            body: []
          }
        });
        return true;
      }

      // Validate URL
      const urlObj = new URL(url);
      if (!['http:', 'https:'].includes(urlObj.protocol)) {
        throw new ProxyError('Unsupported protocol', 403);
      }

      // Check if origin is allowed
      const settings = await chrome.storage.local.get(['proxyEnabled', 'proxyMode', 'allowedDomains']);
      if (!settings.proxyEnabled) {
        throw new ProxyError('Proxy is disabled', 403);
      }

      if (settings.proxyMode === 'custom') {
        const allowed = settings.allowedDomains.some(domain =>
          origin === domain ||
          origin.endsWith(`.${domain}`) ||
          domain.endsWith(`.${origin}`)
        );
        if (!allowed) {
          throw new ProxyError('Origin not allowed', 403);
        }
      }

      // Perform the actual fetch
      const response = await fetch(url, {
        method,
        headers,
        body,
        credentials: 'include' // Include cookies and credentials
      });

      // Clone the response
      const clonedResponse = await response.clone();

      // Read response body as ArrayBuffer
      const responseBody = await clonedResponse.arrayBuffer();

      // Get headers
      const responseHeaders = {};
      clonedResponse.headers.forEach((value, key) => {
        responseHeaders[key.toLowerCase()] = value;
      });

      // Modify headers to bypass CORS
      responseHeaders['access-control-allow-origin'] = origin;
      responseHeaders['access-control-allow-credentials'] = 'true';
      responseHeaders['access-control-allow-methods'] = 'GET, POST, PUT, DELETE, OPTIONS, PATCH';
      responseHeaders['access-control-allow-headers'] = 'Origin, Content-Type, Accept, Authorization';

      sendResponse({
        success: true,
        response: {
          status: response.status,
          statusText: response.statusText,
          headers: responseHeaders,
          body: Array.from(new Uint8Array(responseBody))
        }
      });
    } catch (error) {
      sendResponse({
        success: false,
        error: error.message,
        status: error.status || 500
      });

      // Optionally notify the popup of the error
      chrome.runtime.sendMessage({
        type: 'proxyError',
        error: `Error: ${error.message} (${error.status || 500})`
      });
    }

    // Return true to indicate that sendResponse will be called asynchronously
    return true;
  }
});

---

// content.js

(async function () {
  let isEnabled = true;
  let customDomains = [];

  // Function to inject inject.js into the webpage
  function injectScript() {
    const script = document.createElement('script');
    script.src = chrome.runtime.getURL('inject.js');
    script.onload = () => script.remove();
    (document.head || document.documentElement).appendChild(script);
  }

  // Function to initialize settings from storage
  async function initializeSettings() {
    const settings = await chrome.storage.local.get([
      'proxyEnabled',
      'proxyMode',
      'allowedDomains'
    ]);

    isEnabled = settings.proxyEnabled ?? true;

    if (settings.proxyMode === 'custom') {
      customDomains = settings.allowedDomains ?? [];
      const currentDomain = window.location.hostname;
      if (!customDomains.some(domain =>
        currentDomain === domain ||
        currentDomain.endsWith(`.${domain}`) ||
        domain.endsWith(`.${currentDomain}`)
      )) {
        isEnabled = false;
      }
    }

    // Dispatch event to inform inject.js of settings
    window.dispatchEvent(new CustomEvent('proxySettingsUpdated', {
      detail: { isEnabled }
    }));
  }

  // Initialize settings and inject script
  await initializeSettings();

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', injectScript);
  } else {
    injectScript();
  }

  // Listen for settings changes
  chrome.storage.onChanged.addListener((changes) => {
    if (changes.proxyEnabled || changes.proxyMode || changes.allowedDomains) {
      initializeSettings();
    }
  });

})();

---

// inject.js

(function () {
  const originalFetch = window.fetch.bind(window);
  const originalXHR = window.XMLHttpRequest;
  let isProxyEnabled = true;

  window.addEventListener('proxySettingsUpdated', (event) => {
    isProxyEnabled = event.detail.isEnabled;
  });

  class ProxyInterceptor {
    static async sendProxyRequest(requestDetails) {
      return new Promise((resolve, reject) => {
        const channel = new MessageChannel();

        channel.port1.onmessage = (event) => {
          if (event.data.error) {
            reject(new Error(event.data.error));
          } else {
            resolve(event.data.response);
          }
        };

        chrome.runtime.sendMessage(
          {
            type: 'proxy_request',
            request: requestDetails
          },
          channel.port2
        );
      });
    }

    static createProxiedResponse(response) {
      const resInit = {
        status: response.status,
        statusText: response.statusText,
        headers: new Headers(response.headers),
      };

      // Convert body array back to Blob
      const blob = new Blob([new Uint8Array(response.body)], { type: response.headers['content-type'] || 'application/octet-stream' });
      return new Response(blob, resInit);
    }
  }

  // Override fetch
  window.fetch = async function (input, init = {}) {
    if (!isProxyEnabled) {
      return originalFetch(input, init);
    }

    try {
      const url = typeof input === 'string' ? input : input.url;
      const method = init.method || 'GET';
      const headers = new Headers(init.headers || {});
      const body = init.body || null;

      const requestDetails = {
        method,
        url,
        headers: Object.fromEntries(headers.entries()),
        body,
        origin: window.location.origin,
      };

      const response = await ProxyInterceptor.sendProxyRequest(requestDetails);
      return ProxyInterceptor.createProxiedResponse(response);
    } catch (error) {
      console.warn('CORS Proxy Error:', error);
      return originalFetch(input, init);
    }
  };

  // Override XMLHttpRequest
  function ProxiedXHR() {
    const xhr = new originalXHR();
    const proxiedXHR = this;

    let requestMethod = '';
    let requestUrl = '';
    let requestHeaders = {};
    let isAsync = true;
    let requestBody = null;
    let eventListeners = {};

    proxiedXHR.open = function (method, url, async = true) {
      requestMethod = method;
      requestUrl = url;
      isAsync = async;
      if (!isProxyEnabled) {
        xhr.open(method, url, async);
      }
    };

    proxiedXHR.setRequestHeader = function (header, value) {
      requestHeaders[header] = value;
      if (!isProxyEnabled) {
        xhr.setRequestHeader(header, value);
      }
    };

    proxiedXHR.addEventListener = function (type, listener) {
      eventListeners[type] = eventListeners[type] || [];
      eventListeners[type].push(listener);
      if (!isProxyEnabled) {
        xhr.addEventListener(type, listener);
      }
    };

    proxiedXHR.send = async function (body) {
      requestBody = body;
      if (!isProxyEnabled) {
        return xhr.send(body);
      }

      try {
        const headersLowerCase = {};
        for (const key in requestHeaders) {
          headersLowerCase[key.toLowerCase()] = requestHeaders[key];
        }

        const requestDetails = {
          method: requestMethod,
          url: requestUrl,
          headers: headersLowerCase,
          body: requestBody,
          origin: window.location.origin,
        };

        const response = await ProxyInterceptor.sendProxyRequest(requestDetails);

        // Set XHR properties
        proxiedXHR.status = response.status;
        proxiedXHR.statusText = response.statusText;
        proxiedXHR.response = new Uint8Array(response.body).buffer;
        proxiedXHR.responseText = new TextDecoder().decode(new Uint8Array(response.body));
        proxiedXHR.readyState = 4;

        // Trigger events
        if (eventListeners['readystatechange']) {
          eventListeners['readystatechange'].forEach((listener) => listener());
        }
        if (eventListeners['load']) {
          eventListeners['load'].forEach((listener) => listener());
        }
      } catch (error) {
        console.warn('CORS Proxy Error:', error);
        // Fallback to original XHR
        xhr.open(requestMethod, requestUrl, isAsync);
        for (const [header, value] of Object.entries(requestHeaders)) {
          xhr.setRequestHeader(header, value);
        }
        xhr.send(requestBody);

        // Forward events
        ['readystatechange', 'load', 'error', 'abort'].forEach((event) => {
          xhr.addEventListener(event, function (e) {
            if (eventListeners[event]) {
              eventListeners[event].forEach(listener => listener(e));
            }
          });
        });
      }
    };

    return proxiedXHR;
  }

  window.XMLHttpRequest = ProxiedXHR;
})();

---

popup.html
This HTML file structures the user interface for the extension's popup.


<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>CORS Bypass Settings</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <div class="container">
    <div class="row">
      <h3>CORS Bypass Proxy</h3>
      <label class="switch">
        <input type="checkbox" id="enableProxy">
        <span class="slider"></span>
      </label>
    </div>

    <div>
      <label>
        <input type="radio" name="mode" value="all" checked> Enable for all websites
      </label>
      <br>
      <label>
        <input type="radio" name="mode" value="custom"> Enable for specific websites
      </label>
    </div>

    <div id="customDomains" style="display: none;">
      <label>Allowed Domains (one per line):</label>
      <textarea id="domains" placeholder="example.com"></textarea>
    </div>

    <div>
      <label for="maxBodySize">Max Request Body Size (MB):</label>
      <input type="number" id="maxBodySize" min="1" max="50" value="10">
    </div>

    <div>
      <label for="timeout">Request Timeout (seconds):</label>
      <input type="number" id="timeout" min="5" max="60" value="30">
    </div>

    <div class="status" id="proxyStatus">Proxy Active</div>
    <div class="error" id="errorLog"></div>
  </div>
  <script src="popup.js"></script>
</body>
</html>

---

 popup.js
This script manages interactions within the popup, handling user inputs and storing configurations.


// popup.js

document.addEventListener('DOMContentLoaded', async () => {
  const settings = await chrome.storage.local.get([
    'proxyEnabled',
    'proxyMode',
    'allowedDomains',
    'maxBodySize',
    'timeout'
  ]);

  const enableProxy = document.getElementById('enableProxy');
  const modeInputs = document.getElementsByName('mode');
  const customDomains = document.getElementById('customDomains');
  const domains = document.getElementById('domains');
  const maxBodySize = document.getElementById('maxBodySize');
  const timeout = document.getElementById('timeout');
  const proxyStatus = document.getElementById('proxyStatus');
  const errorLog = document.getElementById('errorLog');

  // Initialize values
  enableProxy.checked = settings.proxyEnabled ?? true;
  maxBodySize.value = settings.maxBodySize ?? 10;
  timeout.value = settings.timeout ?? 30;
  
  for (const input of modeInputs) {
    if (input.value === (settings.proxyMode ?? 'all')) {
      input.checked = true;
    }
  }

  customDomains.style.display = settings.proxyMode === 'custom' ? 'block' : 'none';
  domains.value = (settings.allowedDomains ?? []).join('\n');

  updateStatus();

  // Event listeners
  enableProxy.addEventListener('change', async () => {
    await saveSettings();
    updateStatus();
    await updateIcon();
  });

  for (const input of modeInputs) {
    input.addEventListener('change', async () => {
      customDomains.style.display = input.value === 'custom' ? 'block' : 'none';
      await saveSettings();
    });
  }

  domains.addEventListener('input', saveSettings);
  maxBodySize.addEventListener('input', saveSettings);
  timeout.addEventListener('input', saveSettings);

  // Listen for status updates from background
  chrome.runtime.onMessage.addListener((message) => {
    if (message.type === 'proxyError') {
      errorLog.textContent = message.error;
      setTimeout(() => {
        errorLog.textContent = '';
      }, 5000);
    }
  });

  async function saveSettings() {
    const mode = document.querySelector('input[name="mode"]:checked').value;
    const domainList = domains.value
      .split('\n')
      .map(d => d.trim())
      .filter(d => d);
    
    const mb = parseInt(maxBodySize.value, 10);
    const to = parseInt(timeout.value, 10);
    if (isNaN(mb) || mb < 1 || mb > 50) {
      alert('Max Request Body Size must be between 1 and 50 MB.');
      return;
    }
    if (isNaN(to) || to < 5 || to > 60) {
      alert('Request Timeout must be between 5 and 60 seconds.');
      return;
    }

    await chrome.storage.local.set({
      proxyEnabled: enableProxy.checked,
      proxyMode: mode,
      allowedDomains: domainList,
      maxBodySize: mb,
      timeout: to
    });

    // Update status and icon
    updateStatus();
    await updateIcon();
  }

  function updateStatus() {
    proxyStatus.textContent = enableProxy.checked ? 'Proxy Active' : 'Proxy Inactive';
    proxyStatus.className = `status ${enableProxy.checked ? 'active' : 'inactive'}`;
  }

  async function updateIcon() {
    const icon = enableProxy.checked ? 'icon16.png' : 'icon16-disabled.png';
    await chrome.action.setIcon({
      path: {
        16: `icons/${icon}`,
        32: `icons/${icon.replace('16', '32')}`,
        128: `icons/${icon.replace('16', '128')}`
      }
    });
  }
});

---

styles.css
This stylesheet defines the visual appearance of the popup interface.

body {
      width: 350px;
      padding: 15px;
      font-family: system-ui, -apple-system, sans-serif;
    }
    .container {
      display: flex;
      flex-direction: column;
      gap: 15px;
    }
    .switch {
      position: relative;
      display: inline-block;
      width: 50px;
      height: 24px;
    }
    .switch input {
      opacity: 0;
      width: 0;
      height: 0;
    }
    .slider {
      position: absolute;
      cursor: pointer;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: #ccc;
      transition: .4s;
      border-radius: 24px;
    }
    .slider:before {
      position: absolute;
      content: "";
      height: 16px;
      width: 16px;
      left: 4px;
      bottom: 4px;
      background-color: white;
      transition: .4s;
      border-radius: 50%;
    }
    input:checked + .slider {
      background-color: #2196F3;
    }
    input:checked + .slider:before {
      transform: translateX(26px);
    }
    .row {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .status {
      padding: 8px;
      border-radius: 4px;
      margin-top: 10px;
    }
    .status.active {
      background-color: #e8f5e9;
      color: #2e7d32;
    }
    .status.inactive {
      background-color: #ffebee;
      color: #c62828;
    }
    textarea {
      width: 100%;
      height: 80px;
      resize: vertical;
    }
    .error {
      color: #c62828;
      font-size: 12px;
      margin-top: 5px;
    }

---