Examine source code of Pomodoro 6bits

{
  "manifest_version": 2,
  "name": "Pomodoro Dashboard",
  "description": "Extension Pomodoro personnelle avec dashboard web pour suivi des sessions de travail par projet. Interface simple et intuitive avec authentification commune entre l'extension et l'application web.",
  "version": "1.0.2",
  "author": "Jean I. (Kesskisspass)",
  "homepage_url": "https://pomodoro-6bits.vercel.app/",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  },
  "permissions": [
    "storage",
    "alarms",
    "https://pomodoro-6bits.vercel.app/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{c60888dc-f7a0-4724-9a37-6fb4c11bc905}"
    }
  }
}