Examine source code of Download Cleaner Lite

{
  "manifest_version": 2,
  "name": "Download Cleaner Lite",
  "description": "Automatically removes downloads from history.",
  "icons": {
    "48": "Icon48.png",
    "64": "Icon64.png"
  },
  "version": "2.3",
  "background": {
    "scripts": [
      "lib/options.js",
      "main.js"
    ]
  },
  "permissions": [
    "downloads",
    "history",
    "storage",
    "alarms"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "applications": {
    "gecko": {
      "id": "download-cleaner-lite@futuretech.in"
    }
  }
}