Examine source code of Meta Shield

{
  "manifest_version": 2,
  "name": "Meta Shield",
  "version": "1.0",
  "description": "Catches Meta trackers red-handed and blocks them instantly.",
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Meta Shield Status"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "metashield-v2@yourdomain.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}