Examine source code of Light blue vs

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Light blue vs",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(225, 234, 239)",
      "toolbar_text": "rgb(124, 131, 147)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(32, 60, 116)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(79, 84, 174)",
      "tab_line": "rgb(77, 126, 167)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(89, 115, 177)",
      "tab_loading": "rgb(77, 126, 167)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c74f71d-98a2-4e94-8ccf-881f00f3a3b9}"
    }
  }
}