Examine source code of Randomize Bookmark

{
  "manifest_version": 2,
  "name": "Random Bookmark",
  "version": "1.1resigned1",
  "homepage_url": "https://github.com/abiduzz420/Firfox-AddOn-RandomBookmark",
  "description": "Loads a random bookmark from your recent bookmark list",
  "icons": {
    "48": "icons/flashcards.png",
    "96": "icons/flashcards.png"
  },
  "permissions": [
    "tabs",
    "bookmarks"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "48": "icons/flashcards.png",
      "96": "icons/flashcards.png"
    },
    "default_title": "Load some bookmark"
  },
  "background": {
    "scripts": [
      "bookmark.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0eaa568-7371-4b1b-a1c6-d15fc3d381d9}"
    }
  }
}