Examine source code of MCR "Three Cheers" theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "MCR \"Three Cheers\" theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.5)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(2, 23, 37)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(204, 85, 81)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "icons": "rgb(255, 255, 255)",
      "tab_loading": "rgb(204, 85, 81)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e30ce01-0cda-4936-8106-a868f0ecf829}"
    }
  }
}