Examine source code of Super Productivity

{
  "version": "0.5.4",
  "name": "Super Productivity",
  "background": {
    "page": "background.html"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon_32x32.png"
  },
  "icons": {
    "128": "icon_128x128.png"
  },
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "super-productivity-web-extension@code.swecha.org",
      "data_collection_permissions": {
        "enabled": false,
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "js": [
        "frontendInterface.bundle.js"
      ],
      "matches": [
        "*://super-productivity.com/app/*",
        "*://app.super-productivity.com/*"
      ],
      "all_frames": true
    }
  ],
  "permissions": [
    "tabs",
    "idle",
    "scripting"
  ]
}