Examine source code of solo2

{
  "name": "solo",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#666666",
      "tab_background_text": "rgba(66, 66, 66, 1)",
      "toolbar": "rgba(54, 54, 54, 1)",
      "bookmark_text": "rgba(82, 82, 82, 1)",
      "toolbar_field": "rgba(61, 61, 61, 1)",
      "toolbar_field_text": "rgba(97, 96, 96, 1)",
      "tab_line": "rgba(133, 133, 133, 1)"
    }
  }
}