Examine source code of Crows, Birds, Zoo_Theme

{
  "name": "Sky Dark_Theme",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "gt (2).jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(181, 155, 155, 0.28)",
      "toolbar_field": "rgba(201, 181, 181, 0.26)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4327bfa6-3020-4ce2-a939-7ab0e2f90e06}"
    }
  }
}