Examine source code of Bookmark

{
  "manifest_version": 2,
  "name": "Bookmark",
  "version": "1.1",
  "description": "Saves scroll positions for websites.",
  "icons": {
    "48": "icons/bookmark-48.png",
    "96": "icons/bookmark-96.png"
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/bookmark-32.png",
    "theme_icons": [
      {
        "light": "icons/bookmark-light-32.png",
        "dark": "icons/bookmark-32.png",
        "size": 32
      }
    ],
    "default_title": "Bookmark",
    "default_popup": "popup/bookmark.html"
  }
}