Examine source code of Deep blue

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_TEMPLATE.png"
    },
    "colors": {
      "frame": "#b8b2b2",
      "tab_background_text": "#030000"
    }
  },
  "version": "2.0",
  "name": "Deep blue",
  "manifest_version": 2
}