Examine source code of Bookmarks extension

{
  "manifest_version": 2,
  "name": "Bookmarks extension",
  "version": "1.1",
  "description": "storage store bookmarks",
  "permissions": [
    "tabs",
    "storage"
  ],
  "commands": {
    "enter_action": {
      "suggested_key": {
        "default": "Ctrl+Y"
      },
      "description": "Send a 'enter_action' event"
    }
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Bookmark extension",
    "default_popup": "popup/popup.html",
    "default_icon": "icons/star.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8f0fb253-3190-4f3b-89cd-6c9e68a95168}"
    }
  }
}