Examine source code of Wander your bookmarks

{
  "manifest_version": 2,
  "name": "Wander",
  "version": "0.85",
  "description": "Wander surprises you with a random page that you bookmarked once upon a time.",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "bookmarks"
  ],
  "chrome_url_overrides": {
    "newtab": "wander.html"
  },
  "chrome_settings_overrides": {
    "homepage": "wander.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/icon-32.png"
    },
    "default_title": "Wander your bookmarks"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{639452e8-9a93-42fe-b5d2-36a2cb70b0c0}"
    }
  }
}