Examine source code of Two Birds Bright

{
  "name": "Two Birds Bright",
  "manifest_version": 2,
  "version": "5.0",
  "theme": {
    "images": {
      "theme_frame": "TwoBrightBirdsH.jpg"
    },
    "colors": {
      "frame": "rgba(234, 232, 219, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(235, 233, 218, 0.08)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(240, 79, 34, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0406148a-329b-45ec-8d48-17e0908ccb80}"
    }
  }
}