Examine source code of Bettermark

{
  "manifest_version": 2,
  "name": "Bettermark",
  "version": "1.0.0",
  "description": "Save and organize your bookmarks with collections in Bettermark. Simple, fast, and organized.",
  "author": "Oz Ertas",
  "homepage_url": "https://bettermark.app",
  "browser_specific_settings": {
    "gecko": {
      "id": "support@bettermark.app",
      "strict_min_version": "58.0"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Save to Bettermark",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_security_policy": "default-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src https://fonts.gstatic.com"
}