Examine source code of helluva boss

{
  "name": "helluva boss",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "helluva_boss_stolas_render_by_kyoshithebrony_detv2of-250t.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(142, 150, 163, 1)",
      "toolbar": "rgba(0, 0, 0, 0.24)",
      "bookmark_text": "rgba(196, 71, 117, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.28)",
      "toolbar_field_text": "rgba(196, 71, 117, 1)",
      "tab_line": "rgba(142, 150, 163, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4764ef66-8ccb-48f2-ba04-b8587771014b}"
    }
  }
}