Examine source code of Mockingjay - Messalla

{
  "name": "Mockingjay - Messalla",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffe3",
      "toolbar": "rgba(255, 250, 219, 0.11)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(255, 253, 240, 1)"
    }
  }
}