Examine source code of Dark Blue Grid

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Blue Grid",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-006-51ab495c5f5dde6a3cddb22484acd00d.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(115, 130, 135, 0.6)",
      "toolbar_text": "rgb(230, 230, 230)",
      "frame": "rgb(20, 55, 80)",
      "tab_background_text": "rgb(230, 230, 230)",
      "toolbar_field": "rgb(230, 230, 230)",
      "toolbar_field_text": "rgb(29, 29, 29)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(20, 55, 80, 0.85)",
      "popup_text": "rgb(230, 230, 230)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{be46b20e-e714-4892-8852-db7058d4cc6e}"
    }
  }
}