Examine source code of frxrnk

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "frxrnk",
  "icons": {
    "96": "/images/96.png"
  },
  "theme": {
    "colors": {
      "toolbar": "rgb(10, 10, 10)",
      "toolbar_text": "rgb(214, 214, 214)",
      "frame": "rgb(10, 10, 10)",
      "tab_background_text": "rgb(128, 128, 128)",
      "toolbar_field": "rgb(10, 10, 10)",
      "toolbar_field_text": "rgb(214, 214, 214)",
      "tab_line": "rgba(39, 143, 183, 0.75)",
      "popup": "rgb(27, 27, 27)",
      "popup_text": "rgb(214, 214, 214)",
      "button_background_active": "rgb(53, 53, 53)",
      "button_background_hover": "rgb(37, 37, 37)",
      "frame_inactive": "rgb(16, 16, 16)",
      "icons_attention": "rgb(39, 143, 183)",
      "icons": "rgb(214, 214, 214)",
      "ntp_background": "rgb(10, 10, 10)",
      "ntp_text": "rgb(214, 214, 214)",
      "popup_border": "rgb(27, 27, 27)",
      "popup_highlight_text": "rgb(214, 214, 214)",
      "popup_highlight": "rgb(37, 37, 37)",
      "sidebar_border": "rgb(27, 27, 27)",
      "sidebar_highlight_text": "rgb(214, 214, 214)",
      "sidebar_highlight": "rgb(53, 53, 53)",
      "sidebar_text": "rgb(214, 214, 214)",
      "sidebar": "rgb(10, 10, 10)",
      "tab_background_separator": "rgb(10, 10, 10)",
      "tab_loading": "rgb(39, 143, 183)",
      "tab_selected": "rgb(10, 10, 10)",
      "tab_text": "rgb(214, 214, 214)",
      "toolbar_bottom_separator": "rgb(10, 10, 10)",
      "toolbar_field_border_focus": "rgb(10, 10, 10)",
      "toolbar_field_border": "rgb(10, 10, 10)",
      "toolbar_field_focus": "rgb(10, 10, 10)",
      "toolbar_field_highlight_text": "rgb(214, 214, 214)",
      "toolbar_field_highlight": "rgba(39, 143, 183, 0.5)",
      "toolbar_field_separator": "rgb(10, 10, 10)",
      "toolbar_field_text_focus": "rgb(214, 214, 214)",
      "toolbar_top_separator": "rgb(10, 10, 10)",
      "toolbar_vertical_separator": "rgb(10, 10, 10)"
    }
  }
}