Examine source code of Bookmark Manager v4

{
  "manifest_version": 2,
  "name": "Bookmark Manager",
  "version": "1.0",
  "description": "Quickly add, view, and manage bookmarks from a popup interface.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "bookmarks",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{358337d5-84e9-4f97-95b5-3fdf95905609}"
    }
  }
}