Examine source code of Calendar Current Week

{
  "description": "Visually marks current week at Google Calendar",
  "manifest_version": 3,
  "name": "Calendar Current Week",
  "version": "1.4",
  "homepage_url": "https://github.com/figarocorso/calendar-current-week",
  "icons": {
    "48": "icons/g_background_48.png",
    "64": "icons/g_background_64.png",
    "96": "icons/g_background_96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://calendar.google.com/*"
      ],
      "js": [
        "change_background.js"
      ]
    }
  ],
  "action": {
    "default_title": "Highlights current week",
    "default_icon": "icons/g_background_48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{91eb4766-8c18-4c8c-bb32-b88d16258f7d}"
    }
  }
}