Examine source code of GRSize

{
  "manifest_version": 3,
  "name": "GRSize",
  "version": "1.2",
  "description": "See GitHub repository sizes before you clone.",
  "icons": {
    "32": "icon_32.png",
    "64": "icon_64.png",
    "128": "icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://api.github.com/*",
    "https://github.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icon_32.png",
      "64": "icon_64.png",
      "128": "icon_128.png"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icon_32.png"
      ],
      "matches": [
        "https://github.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "grsize@pluvivanto.win",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}