Contentscripts are not executed fo… | Apple Developer Forums

Contentscripts are not executed for frames within extension popups even with all_frames set to true.

Manifest.json:

{
  "manifest_version": 2,
  "name": "all_frames contentscript popup issue",
  "description": "all_frames contentscript popup issue",
  "version": "1.0",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [{
    "all_frames": true,
    "matches": ["<all_urls>"],
    "js": ["/content-script.js"]
  }],
  "icons": {
    "16": "/icon.png"
  },
  "browser_action": {
    "browser_style": false,
    "default_popup": "/popup.html"
  }
}

popup.html:

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <title>all_frames contentscript popup issue</title>
</head>

<body>
  <iframe src="https://www.google.com/error"></iframe>
</body>

</html>

content-script.js:

'use strict';

(function () {
  document.head.textContent = '';
  document.body.textContent = '';
  document.body.style.cssText = 'background: red !important';
})();