Examine source code of Steel Mac

{
  "name": "Steel Mac",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Theme FF.png"
    },
    "colors": {
      "frame": "rgba(216, 221, 230, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(235, 235, 235, 1)",
      "bookmark_text": "rgba(173, 50, 50, 1)",
      "toolbar_field": "rgba(207, 207, 207, 1)",
      "toolbar_field_text": "rgba(122, 34, 34, 1)",
      "tab_line": "rgba(207, 54, 54, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0735e2ff-0cb0-4a31-baba-ab6bcba76e16}"
    }
  }
}