Examine source code of RGBfox

{
  "name": "RGBfox",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "f6AIgc.jpg"
    },
    "colors": {
      "frame": "rgba(5, 80, 255, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(51, 51, 51, 1)",
      "bookmark_text": "rgba(250, 245, 245, 1)",
      "toolbar_field": "rgba(3, 2, 2, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f3831a90-6a34-4a17-ab14-2f3daaaca9bd}"
    }
  }
}