Examine source code of Open colors

{
  "name": "Open colors",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "FFFFFF-0.png"
    },
    "colors": {
      "frame": "rgba(33, 37, 41, 1)",
      "tab_background_text": "rgba(233, 236, 239, 1)",
      "toolbar": "rgba(248, 249, 250, 1)",
      "bookmark_text": "rgba(73, 80, 87, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(73, 80, 87, 1)"
    }
  }
}