Examine source code of niko (dark)

{
  "name": "niko (dark)",
  "manifest_version": 2,
  "version": "1.6",
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#3b3b3b",
      "tab_background_text": "rgba(230, 230, 230, 1)",
      "toolbar": "rgba(0, 0, 0, 0.34)",
      "bookmark_text": "rgba(230, 230, 230, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "popup": "rgba(0, 0, 0, 1)",
      "popup_text": "rgba(230, 230, 230, 1)",
      "popup_highlight": "#fdfd5f",
      "popup_highlight_text": "rgba(30, 30, 30, 1)",
      "toolbar_field_text": "rgba(230, 230, 230, 1)",
      "ntp_background": "rgba(30, 30, 30, 1)",
      "ntp_text": "rgba(230, 230, 230, 1)",
      "toolbar_vertical_separator": "#7f7f7f",
      "toolbar_field_border_focus": "#fdfd5f",
      "toolbar_field_highlight": "#fefe9a",
      "toolbar_field_highlight_text": "rgba(30, 30, 30, 1)",
      "tab_text": "#fdfd5f",
      "tab_line": "#fdfd5f",
      "tab_loading": "#fdfd5f",
      "sidebar": "rgba(30, 30, 30, 1)",
      "sidebar_text": "rgba(230, 230, 230, 1)",
      "sidebar_border": "rgba(130, 130, 130, 1)",
      "sidebar_highlight": "rgba(255, 255, 255, 0.1)",
      "sidebar_highlight_text": "#fdfd5f"
    }
  }
}