Examine source code of TongassTwilight

{
  "name": "TongassTwilight",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "TongassTwilight.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(199, 242, 189, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{766c5aa2-d413-437d-b8cd-52ccde0f663e}"
    }
  }
}