Examine source code of OuttaTime

{
  "manifest_version": 2,
  "name": "OuttaTime",
  "version": "1.0",
  "description": "Stop pages from attempting to load after a specified amount of time.",
  "homepage_url": "https://superuser.com/questions/1479808/how-do-i-configure-firefox-to-automatically-stop-loading-pages-after-set-amount",
  "permissions": [
    "*://*/*",
    "alarms",
    "tabs",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  },
  "applications": {
    "gecko": {
      "id": "outtatime@sanin.dev"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}