Examine source code of Better Legislation

{
  "manifest_version": 2,
  "name": "Better Legislation",
  "version": "1.1.0",
  "description": "The extension changes the typography on UK legislation to make it more visually appealing.",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "144": "icon144.png"
  },
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "matches": [
        "https://thegazette.co.uk/*",
        "https://www.thegazette.co.uk/*",
        "https://www.legislation.gov.uk/*",
        "https://api.parliament.uk/*",
        "https://hansard.parliament.uk/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ba34f52d-8cf9-427d-9b62-38e6e939d559}"
    }
  }
}