Examine source code of Concreted

{
  "name": "Concreted",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Image1.jpg"
    },
    "colors": {
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar": "rgb(0, 108, 143)",
      "bookmark_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(187, 202, 206)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)"
    }
  }
}