Examine source code of Refined ProtonCalendar

{
  "manifest_version": 2,
  "name": "Refined ProtonCalendar",
  "description": "Implements a number of usability improvements in the ProtonCalendar web app",
  "homepage_url": "https://github.com/jasonku/refined-protoncalendar",
  "version": "1.7",
  "icons": {
    "48": "icons/icon.png",
    "96": "icons/icon@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://calendar.proton.me/*"
      ],
      "js": [
        "./improvements.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{32370737-02e2-4a76-9d51-b06f045912e9}"
    }
  }
}