Examine source code of Ubuntu Ambiance Gradient

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#878787",
      "tab_background_text": "#0a0a0a"
    }
  },
  "version": "2.0",
  "name": "Ubuntu Ambiance Gradient",
  "manifest_version": 2,
  "description": "Persona for ubuntu ambiance style. Images are from Blazemore's persona. Only text and background colors are changed"
}