Examine source code of Confluence dark mode

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Confluence dark mode",
  "version": "1",
  "description": "Apply dark mode on a Confluence wiki",
  "browser_action": {
    "default_icon": "./images/icon.png",
    "default_popup": "./popup/popup.html",
    "icons": {
      "16": "./images/icon16.png",
      "48": "./images/icon32.png"
    }
  },
  "content_scripts": [
    {
      "css": [
        "style.css"
      ],
      "matches": [
        "https://portail.etat-de-vaud.ch/outils/wiki1/*"
      ]
    }
  ]
}