Examine source code of Slim Chance Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Slim Chance Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(62, 62, 62, 0.61)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(43, 204, 240)",
      "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(36, 150, 176)",
      "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(236, 236, 236)",
      "popup_border": "rgb(36, 150, 176)",
      "popup_highlight_text": "rgb(36, 150, 176)",
      "sidebar_border": "rgb(43, 204, 240)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(236, 236, 236)",
      "tab_background_separator": "rgb(43, 204, 240)",
      "tab_selected": "rgba(62, 62, 62, 0.61)",
      "toolbar_bottom_separator": "rgb(36, 150, 176)",
      "toolbar_field_border": "rgb(101, 128, 136)",
      "tab_loading": "rgb(36, 150, 176)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3fd23f99-1c5a-46e7-9af9-1a058d311f70}"
    }
  }
}