Examine source code of Blue Rock

{
  "name": "Blue Rock",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "water-coast-header-800x200-604x200.jpg"
    },
    "colors": {
      "frame": "rgba(19, 89, 240, 1)",
      "tab_background_text": "rgba(8, 55, 207, 1)",
      "toolbar": "rgba(27, 95, 222, 1)",
      "bookmark_text": "rgba(40, 143, 184, 1)",
      "toolbar_field": "rgba(247, 242, 242, 1)",
      "toolbar_field_text": "rgba(227, 204, 204, 1)"
    }
  }
}