Examine source code of Timely

{
  "manifest_version": 3,
  "name": "Timely",
  "version": "2.0.15",
  "description": "20-20-20 Timer",
  "background": {
    "scripts": [
      "./background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "notifications",
    "storage",
    "alarms"
  ],
  "action": {
    "default_popup": "index.html"
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "202020timer@connersbrianwebsite.xyz"
    }
  }
}