Examine source code of Night Mountains Dark

{
  "manifest_version": 2,
  "version": "1.1.3",
  "name": "Night Mountains Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(10, 10, 10, 0.4)",
      "toolbar_text": "rgba(240, 250, 250, 0.9)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(160, 160, 160)",
      "toolbar_field": "rgba(10, 10, 10, 0.4)",
      "toolbar_field_text": "rgba(240, 250, 250, 0.9)",
      "tab_line": "rgba(240, 240, 240, 0.2)",
      "popup": "rgba(10, 10, 10, 0.8)",
      "popup_text": "rgba(240, 240, 240, 0.9)",
      "button_background_active": "rgba(200, 255, 255, 0.1)",
      "button_background_hover": "rgba(240, 240, 240, 0.1)",
      "icons_attention": "rgba(140, 240, 255, 0.7)",
      "icons": "rgba(240, 250, 250, 0.9)",
      "sidebar": "rgb(5, 10, 15)",
      "tab_selected": "rgba(10, 10, 10, 0.4)",
      "tab_loading": "rgba(240, 240, 240, 0.2)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9ccc7648-32ba-4f92-88e1-4ebaca01cc82}"
    }
  }
}