Examine source code of MudFlood

{
  "name": "MudFlood",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "MudFlood.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(240, 190, 140, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{27e2d146-ba38-4278-b96b-10931988c2ab}"
    }
  }
}