Examine source code of The Beta Demon

{
  "name": "The Beta Demon",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "beta bendy firefox.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(43, 32, 24, 1)",
      "toolbar": "rgba(43, 35, 33, 0.37)",
      "bookmark_text": "rgba(148, 120, 89, 1)",
      "toolbar_field": "rgba(140, 113, 91, 0.21)",
      "toolbar_field_text": "rgba(130, 108, 90, 0.78)"
    }
  }
}