Examine source code of darGallery

{
  "theme": {
    "images": {
      "theme_frame": "darGallery.jpg"
    },
    "colors": {
      "frame": "#5d88bd",
      "tab_background_text": "#11ab8a"
    }
  },
  "version": "2.0",
  "name": "darGallery",
  "manifest_version": 2,
  "description": "test"
}