Examine source code of WIT-Sysadmin

{
  "name": "WIT-Sysadmin",
  "manifest_version": 2,
  "version": "6.0",
  "theme": {
    "images": {
      "theme_frame": "wit_001b.png"
    },
    "colors": {
      "frame": "rgba(92, 92, 92, 1)",
      "tab_background_text": "rgba(230, 230, 230, 1)",
      "toolbar": "rgba(33, 33, 33, 1)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(82, 82, 82, 1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(125, 61, 153, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6d1f7d4f-3d3c-4a5b-a0ad-44c152458a29}"
    }
  }
}