Examine source code of Media Harvest : twitter Media Downloader

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "short_name": "MediaHarvest",
  "description": "__MSG_appDesc__",
  "version": "4.2.0",
  "version_name": "4.2.0 (firefox)",
  "default_locale": "en",
  "icons": {
    "16": "assets/icons/icon@16.png",
    "32": "assets/icons/icon@32.png",
    "48": "assets/icons/icon@48.png",
    "128": "assets/icons/icon@128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "assets/icons/icon@16.png",
      "32": "assets/icons/icon@32.png",
      "48": "assets/icons/icon@48.png",
      "128": "assets/icons/icon@128.png"
    },
    "default_popup": "index.html?tab=popup"
  },
  "options_ui": {
    "page": "index.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "sw.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://twitter.com/*",
        "*://mobile.twitter.com/*",
        "*://tweetdeck.twitter.com/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "*://twitter.com/*",
    "*://mobile.twitter.com/*",
    "*://api.twitter.com/*",
    "*://tweetdeck.twitter.com/*",
    "*://x.com/*",
    "*://*.x.com/*",
    "downloads",
    "cookies",
    "storage",
    "notifications",
    "unlimitedStorage"
  ],
  "content_security_policy": "default-src 'self'; connect-src 'self' https://o1169684.ingest.sentry.io https://api.webext.prod.mediaharvest.app https://cognito-identity.ap-northeast-1.amazonaws.com https://twitter.com https://api.twitter.com; style-src https://fonts.googleapis.com 'unsafe-inline'; font-src https://fonts.gstatic.com; script-src 'self'; img-src https://via.placeholder.com https://pbs.twimg.com;",
  "browser_specific_settings": {
    "gecko": {
      "id": "mediaharvest@addons.mozilla.org",
      "strict_min_version": "90.0"
    }
  }
}