Examine source code of Clean Social

{
  "manifest_version": 3,
  "name": "Clean Social",
  "version": "0.1.0",
  "description": "Privacy-first utility mode for social websites and opt-in explicit content shield.",
  "browser_specific_settings": {
    "gecko": {
      "id": "clean-social@cleansocial.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'none'; base-uri 'none'; frame-ancestors 'none'; upgrade-insecure-requests"
  },
  "optional_permissions": [
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "*://instagram.com/*",
    "*://*.instagram.com/*",
    "*://youtube.com/*",
    "*://*.youtube.com/*",
    "*://reddit.com/*",
    "*://*.reddit.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "*://instagram.com/*",
        "*://*.instagram.com/*",
        "*://youtube.com/*",
        "*://*.youtube.com/*",
        "*://reddit.com/*",
        "*://*.reddit.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_title": "Clean Social",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}