Examine source code of Simple Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Deep Blue",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(25, 28, 60)",
      "toolbar_text": "rgb(125, 132, 204)",
      "frame": "rgb(25, 28, 60)",
      "tab_background_text": "rgb(169, 183, 199)",
      "toolbar_field": "rgba(143, 165, 242, 0.31)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0)",
      "popup": "rgb(31, 34, 61)",
      "popup_text": "rgb(157, 166, 255)",
      "ntp_background": "rgb(39, 44, 68)",
      "tab_selected": "rgba(157, 166, 255, 0.25)",
      "tab_text": "rgb(182, 186, 255)",
      "toolbar_field_focus": "rgba(68, 71, 113, 0.5)",
      "tab_loading": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{857f6420-db9e-488b-acfa-4ac2520b9a0f}"
    }
  }
}