Examine source code of Bookmark Manager

{
  "manifest_version": 2,
  "name": "Bookmark Manager",
  "description": "Save your important links to Bookmark Manager with their specific categories and tags. Now you will never loose any important links.",
  "version": "1.0.0",
  "icons": {
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "index.html"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "bookmark@manager.com",
      "strict_min_version": "42.0"
    }
  }
}