Examine source code of eBay Dark Theme

{
  "manifest_version": 3,
  "name": "eBay Dark Theme",
  "version": "1.1",
  "description": "Applies a dark theme to eBay.",
  "browser_specific_settings": {
    "gecko": {
      "id": "ebay-dark-theme@yourname.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "host_permissions": [
    "*://*.ebay.com/*",
    "*://*.ebay.co.uk/*",
    "*://*.ebay.ca/*",
    "*://*.ebay.com.au/*",
    "*://*.ebay.de/*",
    "*://*.ebaydesc.com/*",
    "*://*.ebaydesc.co.uk/*",
    "*://*.ebaydesc.ca/*",
    "*://*.ebaydesc.com.au/*",
    "*://*.ebaydesc.de/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.ebay.com/*",
        "*://*.ebay.co.uk/*",
        "*://*.ebay.ca/*",
        "*://*.ebay.com.au/*",
        "*://*.ebay.de/*",
        "*://*.ebaydesc.com/*",
        "*://*.ebaydesc.co.uk/*",
        "*://*.ebaydesc.ca/*",
        "*://*.ebaydesc.com.au/*",
        "*://*.ebaydesc.de/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ]
}