Examine source code of blackwhites

{
  "name": "blackwhites",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "2.png"
    },
    "colors": {
      "frame": "rgba(60, 100, 194, 1)",
      "tab_background_text": "rgba(184, 14, 14, 1)",
      "toolbar": "rgba(21, 214, 172, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a69589a-051f-4b04-ba77-c6bf0c129016}"
    }
  }
}