Examine source code of Auto Save HTML

{
  "description": "Auto Save HTML is a small extension which can be used to automatically download the HTML document(s) of a specified website when browsing that same website.",
  "manifest_version": 2,
  "name": "Auto Save HTML",
  "version": "2.0.3",
  "homepage_url": "https://github.com/nunoarruda/auto-save-html",
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "downloads",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "nuno@nunoarruda.com",
      "strict_min_version": "57.0a1"
    }
  }
}