Examine source code of Snail's House Pixelize

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Snail's House Pixelize",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 234, 239, 0)",
      "toolbar_text": "rgb(71, 0, 189)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(87, 36, 111)",
      "toolbar_field": "rgba(224, 111, 255, 0.5)",
      "toolbar_field_text": "rgba(71, 0, 189, 0.9)",
      "tab_line": "rgb(145, 0, 255)",
      "popup": "rgb(87, 36, 111)",
      "popup_text": "rgb(218, 183, 255)",
      "button_background_active": "rgba(195, 87, 247, 0.75)",
      "button_background_hover": "rgba(242, 228, 255, 0.75)",
      "ntp_background": "rgb(60, 19, 95)",
      "ntp_text": "rgb(250, 241, 255)",
      "popup_border": "rgba(129, 0, 183, 0.5)",
      "popup_highlight_text": "rgb(240, 225, 255)",
      "popup_highlight": "rgb(153, 30, 191)",
      "toolbar_bottom_separator": "rgba(180, 0, 255, 0.19)",
      "toolbar_field_border_focus": "rgba(129, 0, 183, 0.19)",
      "toolbar_field_border": "rgba(129, 0, 183, 0.25)",
      "toolbar_field_focus": "rgb(87, 36, 111)",
      "toolbar_field_highlight_text": "rgb(253, 246, 255)",
      "toolbar_field_highlight": "rgb(213, 102, 255)",
      "toolbar_field_text_focus": "rgb(218, 183, 255)",
      "tab_loading": "rgb(145, 0, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a57c5c12-85f6-4783-88f0-60778c2ad9a3}"
    }
  }
}