Examine source code of Bookmark Manager

{
  "name": "Bookmark Manager",
  "version": "2.3.8",
  "description": "Displays and organises your bookmarks",
  "permissions": [
    "storage",
    "bookmarks",
    "history"
  ],
  "icons": {
    "128": "images/BM squish@8x.png"
  },
  "chrome_url_overrides": {
    "newtab": "newTab.html"
  },
  "options_page": "options.html",
  "background": {
    "scripts": [
      "main.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "images/BM squish@8x.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{5804f91d-fa3b-47f0-ac61-f4813c4ef76a}"
    }
  }
}