Examine source code of Disable Code Ligatures

{
  "manifest_version": 3,
  "name": "Disable Code Ligatures",
  "short_name": "Disable Code Ligatures",
  "description": "Disable ligatures in all <code> elements on all pages.",
  "version": "0.1.0",
  "version_name": "0.1.0",
  "minimum_chrome_version": "99",
  "browser_specific_settings": {
    "gecko": {
      "id": "@disable-code-ligatures.warren-halderman",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "id": "@disable-code-ligatures.warren-halderman",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "safari": {
      "strict_min_version": "15.4"
    }
  },
  "icons": {
    "16": "assets/icon.png",
    "32": "assets/icon.png",
    "48": "assets/icon.png",
    "128": "assets/icon.png"
  },
  "author": "Warren Halderman <halderman.warren@gmail.com>",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "no-ligatures.css"
      ],
      "all_frames": true
    }
  ]
}