Examine source code of Slender Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Slender Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(62, 62, 62, 0.61)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(126, 175, 103)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(62, 62, 62, 0.61)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(126, 175, 103)",
      "popup": "rgba(62, 62, 62, 0.61)",
      "popup_text": "rgb(255, 255, 255)",
      "icons_attention": "rgb(255, 255, 255)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(126, 175, 103)",
      "popup_border": "rgb(126, 175, 103)",
      "popup_highlight_text": "rgb(90, 124, 74)",
      "sidebar_border": "rgb(126, 175, 103)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(236, 236, 236)",
      "tab_background_separator": "rgb(126, 175, 103)",
      "tab_selected": "rgba(62, 62, 62, 0.61)",
      "toolbar_bottom_separator": "rgb(126, 175, 103)",
      "toolbar_field_border": "rgb(126, 175, 103)",
      "tab_loading": "rgb(126, 175, 103)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{eb2318a3-36e2-43fd-9e68-37e0a6be72e8}"
    }
  }
}