Examine source code of Ningguang

{
  "name": "thumb-1920-1117821",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "thumb-1920-1117821.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(252, 122, 75, 1)",
      "toolbar": "rgba(255, 0, 34, 0.3)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(130, 0, 13, 0.3)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e8a4dffe-aafc-4c4d-b288-1d20f9a8b355}"
    }
  }
}