Examine source code of IE3 Dark Mode

{
  "name": "IE3 Dark Mode",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "bitmap3.png"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 0)",
      "tab_background_text": "rgba(255, 255, 255, 0.53)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(255, 255, 255, 1)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(66, 66, 66, 0.53)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f0085e11-f713-4701-9b31-ef8dbb49a217}"
    }
  }
}