Examine source code of Leads tracker

{
  "description": "Checks the users time and then shows a new travel theme every hour.",
  "homepage_url": "https://github.com/Yahya-rabii/Leads-tracker-extension.git",
  "manifest_version": 2,
  "name": "Leads tracker",
  "version": "1.0",
  "permissions": [
    "tabs"
  ],
  "action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "55.0a2",
      "id": "{bdb75889-2c86-45e1-8904-e923f60e77b9}"
    }
  }
}