Examine source code of Dark space pixel

{
  "name": "Dark space pixel",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": ".Фон.jpg"
    },
    "colors": {
      "frame": "rgba(255, 255, 255, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(66, 66, 66, 0.2)",
      "bookmark_text": "rgba(194, 194, 194, 1)",
      "toolbar_field": "rgba(66, 66, 66, 0.2)",
      "toolbar_field_text": "rgba(194, 194, 194, 1)",
      "tab_line": "rgba(194, 194, 194, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{632653d2-a849-4208-acb8-144f73c9fa93}"
    }
  }
}