Examine source code of window sirene

{
  "name": "window sirene",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "4df63cfde216ec347aaf462054ea6817.gif"
    },
    "colors": {
      "frame": "rgba(8, 9, 10, 0.97)",
      "tab_background_text": "rgba(40, 40, 224, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(207, 54, 84, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(240, 226, 226, 1)"
    }
  }
}