Examine source code of Breakout

{
  "manifest_version": 2,
  "version": "4.0",
  "name": "Breakout V4",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(46, 26, 59)",
      "toolbar_text": "rgb(254, 243, 218)",
      "frame": "rgb(248, 196, 104)",
      "tab_background_text": "rgb(248, 243, 236)",
      "toolbar_field": "rgb(216, 168, 96)",
      "toolbar_field_text": "rgb(46, 46, 46)",
      "tab_line": "rgb(199, 121, 27)",
      "popup": "rgb(68, 49, 72)",
      "popup_text": "rgb(244, 236, 216)",
      "button_background_hover": "rgb(224, 168, 78)",
      "popup_highlight": "rgb(217, 124, 71)",
      "toolbar_bottom_separator": "rgb(94, 58, 83)",
      "tab_loading": "rgb(199, 121, 27)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{128bffa5-1bea-46aa-9375-d88e5543f14a}"
    }
  }
}