Examine source code of MediaSniff

{
  "manifest_version": 3,
  "name": "MediaSniff",
  "version": "2.0.4",
  "description": "Detect and copy video/audio stream URLs from any page",
  "permissions": [
    "webRequest",
    "tabs",
    "clipboardWrite",
    "storage",
    "notifications"
  ],
  "host_permissions": [
    "<all_urls>",
    "http://localhost:15151/*",
    "http://localhost:15152/*"
  ],
  "background": {
    "scripts": [
      "lib/media.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "mediasniff@local",
      "strict_min_version": "115.0"
    }
  }
}