Examine source code of Klavier

{
  "name": "Klavier",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "firefox theme test2.png"
    },
    "colors": {
      "frame": "rgba(45, 31, 45, 1)",
      "tab_background_text": "rgba(255, 255, 190, 1)",
      "toolbar": "rgba(156, 81, 109, 0.31)",
      "toolbar_field": "rgba(255, 255, 255, 0.69)",
      "toolbar_field_text": "rgba(156, 83, 111, 1)"
    }
  }
}