Examine source code of mid_blue_grid_1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "mid_blue_grid",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.88)",
      "toolbar_text": "rgb(42, 51, 62)",
      "frame": "rgb(42, 51, 62)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(42, 51, 62, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(42, 51, 62)",
      "popup": "rgb(42, 51, 62)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(0, 0, 0, 0.61)",
      "tab_loading": "rgb(42, 51, 62)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{66090f4c-2f15-4fb8-9ea9-90535f87d06c}"
    }
  }
}