How can I obtain all the webpage resources using a Chrome extension?

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To obtain all the webpage resources using a Chrome extension, you can use the Chrome developer tools API. Here's how:

1. Create a new Chrome extension using the manifest.json and background.js files.
2. In the background.js file, use the chrome.devtools.network.onRequestFinished event to listen for network requests made by the webpage.
3. When a request is finished, get the request details using the chrome.devtools.network.getHAR() function.
4. Extract the resource URLs from the request details and store them in an array or object.
5. Use the chrome.runtime.sendMessage() function to send the resource URLs to the popup or content script of the extension, where you can display or use them however you want.

Here's a sample code snippet that shows how to get the resource URLs:

chrome.devtools.network.onRequestFinished.addListener(
  function(request) {
    var har = chrome.devtools.network.getHAR(function(result) {
      var entries = result.entries;
      for (var i = 0; i < entries.length; i++) {
        var entry = entries[i];
        var url = entry.request.url;
        // Store the URL in an array or object
      }
      // Send the array or object to the popup or content script
      chrome.runtime.sendMessage({resources: resources});
    });
  }
);