Examine source code of Rainbow Bricks

{
  "name": "Rainbow Bricks",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "rainbow brick wall 3000x200_2.jpg"
    },
    "colors": {
      "frame": "rgba(61, 62, 64, 1)",
      "tab_background_text": "rgba(250, 247, 247, 1)",
      "toolbar": "rgba(38, 37, 37, 1)",
      "bookmark_text": "rgba(31, 31, 31, 1)",
      "toolbar_field": "rgba(31, 30, 30, 1)",
      "toolbar_field_text": "rgba(15, 15, 15, 1)"
    }
  }
}