Examine source code of Rainbows at night

{
  "name": "Rainbows at night",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "p0808241-4.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(117, 117, 117, 0.58)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(3, 3, 3, 0.62)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 111, 0, 0.62)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f2bfb4d2-89f3-4f4f-9c92-0f0c65b5e818}"
    }
  }
}