Examine source code of Dark lord

{
  "name": "Dark lord",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "It's so cold for me_.jpg"
    },
    "colors": {
      "frame": "rgba(7, 38, 30, 1)",
      "tab_background_text": "rgba(237, 228, 228, 1)",
      "toolbar": "rgba(1, 3, 15, 1)",
      "bookmark_text": "rgba(245, 27, 19, 1)",
      "toolbar_field": "rgba(9, 57, 87, 1)",
      "toolbar_field_text": "rgba(177, 224, 22, 1)",
      "tab_line": "rgba(3, 145, 41, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fde98307-660f-4b11-8a64-c16e0fd2ec2d}"
    }
  }
}