Examine source code of Blue Silver

{
  "name": "Blue Silver",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "Commonwealth Star.png"
    },
    "colors": {
      "toolbar": "rgba(21, 32, 51, 1)",
      "toolbar_field": "rgba(229, 228, 226, 1)",
      "toolbar_field_text": "rgba(21, 32, 51, 1)",
      "frame": "rgba(162, 173, 160, 1)",
      "tab_background_text": "rgba(21, 32, 51, 1)",
      "bookmark_text": "rgba(229, 228, 226, 1)"
    }
  }
}