Examine source code of Birds - Monochrome

{
  "theme": {
    "images": {
      "theme_frame": "persona.png"
    },
    "colors": {
      "frame": "#ababab",
      "tab_background_text": "#7a7a7a"
    }
  },
  "version": "2.0",
  "name": "Birds - Monochrome",
  "manifest_version": 2,
  "description": "White Birds on black background."
}