Examine source code of mountainous

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "mountainous",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_text": "rgb(221, 223, 232)",
      "frame": "rgb(55, 0, 93)",
      "tab_background_text": "rgb(221, 223, 232)",
      "toolbar_field": "rgba(55, 0, 93, 0)",
      "toolbar_field_text": "rgb(198, 199, 214)",
      "tab_line": "rgb(198, 199, 214)",
      "popup": "rgb(55, 0, 93)",
      "popup_text": "rgb(198, 199, 214)",
      "icons_attention": "rgb(188, 0, 42)",
      "ntp_background": "rgb(122, 136, 173)",
      "popup_border": "rgb(55, 0, 93)",
      "sidebar_border": "rgb(55, 0, 93)",
      "sidebar_text": "rgb(198, 199, 214)",
      "sidebar": "rgb(55, 0, 93)",
      "toolbar_field_border_focus": "rgb(198, 199, 214)",
      "toolbar_field_highlight_text": "rgb(198, 199, 214)",
      "toolbar_field_highlight": "rgb(122, 136, 173)",
      "toolbar_top_separator": "rgba(198, 199, 214, 0)",
      "tab_loading": "rgb(198, 199, 214)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8cde2c14-5baa-473b-ae78-77020c283369}"
    }
  }
}