Examine source code of Go.Data dark mode

{
  "manifest_version": 2,
  "name": "Go.Data dark mode",
  "version": "1.6",
  "description": "Apply dark mode on Go.Data",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_popup": "./popup/popup.html"
  },
  "content_scripts": [
    {
      "css": [
        "style.css"
      ],
      "matches": [
        "https://gestionepidemie.vd.ch/*",
        "https://valid-gestionepidemie.vd.ch/*"
      ]
    }
  ]
}