Examine source code of Bluish world

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Bluish world",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(23, 31, 104)",
      "toolbar_text": "rgb(114, 135, 255)",
      "frame": "rgb(12, 15, 41)",
      "tab_background_text": "rgb(120, 131, 203)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(101, 180, 255)",
      "tab_line": "rgb(32, 68, 255)",
      "popup": "rgb(1, 14, 115)",
      "popup_text": "rgb(255, 193, 0)",
      "tab_loading": "rgb(32, 68, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f318cf32-83ac-4024-99af-6f500e23eb3b}"
    }
  }
}