Examine source code of u-238-dark-theme

{
  "description": "Dark theme",
  "manifest_version": 2,
  "name": "u-238-dark-theme",
  "permissions": [
    "theme"
  ],
  "background": {
    "scripts": [
      "theme.js"
    ]
  },
  "version": "1.2resigned1",
  "applications": {
    "gecko": {}
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ff1347b-5c08-40e0-be87-db5b8a6fbb92}"
    }
  }
}