Examine source code of Messenger Privacy Guard

{
  "manifest_version": 2,
  "name": "Messenger Privacy Guard",
  "version": "1.0.2",
  "description": "Add privacy features to social platforms with intelligent blur controls",
  "permissions": [
    "storage",
    "activeTab",
    "https://www.messenger.com/*",
    "https://messenger.com/*",
    "https://web.facebook.com/messages/*",
    "https://www.facebook.com/messages/*",
    "https://facebook.com/messages/*"
  ],
  "browser_action": {
    "default_popup": "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"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.messenger.com/*",
        "https://messenger.com/*",
        "https://web.facebook.com/messages/*",
        "https://www.facebook.com/messages/*",
        "https://facebook.com/messages/*"
      ],
      "js": [
        "content/blur.js"
      ],
      "css": [
        "content/styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "messenger-privacy@example.com",
      "strict_min_version": "102.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}