Examine source code of FireRix

{
  "name": "Firerix",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "firefox-456.png"
    },
    "colors": {
      "frame": "rgba(209, 126, 54, 0.74)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(173, 173, 173, 0.71)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(199, 134, 84, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(255, 140, 0, 0.72)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{50e5f6c9-35dc-4103-bed6-d074daa349c8}"
    }
  }
}