Examine source code of Button Mash Toolbar

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Button Mash Toolbar",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.31)",
      "toolbar_text": "rgb(91, 91, 91)",
      "frame": "rgb(72, 76, 79)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(141, 141, 141)",
      "tab_line": "rgb(255, 221, 188)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(132, 109, 73)",
      "tab_loading": "rgb(255, 221, 188)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d4e5cf8-9264-4a57-887b-b13628e2f278}"
    }
  }
}