Examine source code of MacOS Linen

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "MacOs Linen",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(123, 123, 123)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(219, 219, 219)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgba(0, 0, 0, 0.25)",
      "popup": "rgb(219, 219, 219)",
      "popup_text": "rgb(0, 0, 0)",
      "icons_attention": "rgb(0, 0, 0)",
      "popup_border": "rgba(164, 164, 164, 0.5)",
      "popup_highlight": "rgba(0, 0, 0, 0.5)",
      "tab_loading": "rgb(0, 0, 0)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0.5)",
      "toolbar_field_border": "rgba(164, 164, 164, 0.5)",
      "toolbar_field_highlight": "rgba(0, 0, 0, 0.1)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0.5)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{93f77495-03fe-410c-b4c7-2cf2f2215474}"
    }
  }
}