Examine source code of acheron-red

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "acheron",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(91, 26, 26)",
      "toolbar_text": "rgb(250, 226, 226)",
      "frame": "rgb(182, 34, 34)",
      "tab_background_text": "rgb(250, 226, 226)",
      "toolbar_field": "rgb(182, 34, 34)",
      "toolbar_field_text": "rgb(250, 226, 226)",
      "tab_line": "rgb(214, 200, 148)",
      "popup": "rgb(182, 34, 34)",
      "popup_text": "rgb(250, 226, 226)",
      "tab_loading": "rgb(214, 200, 148)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a591c284-5f07-4c65-93b1-bf25f3e12788}"
    }
  }
}