Examine source code of Advanced Bookmark Search

{
  "manifest_version": 2,
  "version": "0.1.3",
  "name": "Advanced Bookmark Search",
  "description": "A fast offline search engine for bookmarks that supports searching operators",
  "offline_enabled": true,
  "permissions": [
    "storage",
    "bookmarks"
  ],
  "homepage_url": "https://add0n.com/bookmark-search.html",
  "background": {
    "persistent": false,
    "scripts": [
      "xapian.js",
      "background.js",
      "xapian/xapian_noexception_nowasm.js"
    ]
  },
  "icons": {
    "16": "data/icons/16.png",
    "19": "data/icons/19.png",
    "32": "data/icons/32.png",
    "38": "data/icons/38.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png",
    "256": "data/icons/256.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "data/icons/16.png",
      "19": "data/icons/19.png",
      "32": "data/icons/32.png",
      "38": "data/icons/38.png",
      "64": "data/icons/64.png"
    }
  },
  "commands": {
    "open": {
      "description": "Open the bookmark search in a standalone window"
    }
  }
}