Examine source code of Basic Abstract Brown

{
  "name": "Basic Abstract Brown",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
    },
    "colors": {
      "frame": "rgba(17, 11, 8, 1)",
      "tab_background_text": "rgba(185, 177, 171, 1)",
      "toolbar": "rgba(17, 11, 8, 1)",
      "bookmark_text": "rgba(185, 177, 171, 1)",
      "toolbar_field": "rgba(185, 177, 171, 1)",
      "toolbar_field_text": "rgba(17, 11, 8, 1)",
      "tab_line": "rgba(185, 177, 171, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d6f7c21e-7ff3-435a-98dd-a501383262d3}"
    }
  }
}