Examine source code of Ocean blue

{
  "manifest_version": 2,
  "name": "Ocean",
  "version": "1.1",
  "theme": {
    "colors": {
      "bookmark_text": "hsla(0, 0%, 100%, 1)",
      "frame": "hsla(234, 72%, 12%, 1)",
      "frame_inactive": "hsla(234, 72%, 12%, 1)",
      "icons": "hsla(0, 0%, 100%, 1)",
      "icons_attention": "hsla(220, 70%, 78%, 1)",
      "ntp_background": "hsla(223, 95%, 3%, 1)",
      "ntp_card_background": "hsla(220, 78%, 11%, 1)",
      "ntp_text": "hsla(0, 0%, 100%, 1)",
      "popup": "hsla(220, 78%, 11%, 1)",
      "popup_border": "hsla(220, 69%, 66%, 1)",
      "popup_highlight": "hsla(220, 89%, 69%, 0.2)",
      "popup_highlight_text": "hsla(0, 0%, 100%, 1)",
      "popup_text": "hsla(0, 0%, 100%, 1)",
      "sidebar": "hsla(220, 78%, 11%, 1)",
      "sidebar_highlight": "hsla(220, 89%, 69%, 0.2)",
      "sidebar_highlight_text": "hsla(0, 0%, 100%, 1)",
      "sidebar_text": "hsla(0, 0%, 100%, 1)",
      "tab_background_text": "hsla(0, 0%, 100%, 1)",
      "tab_line": "hsla(220, 54%, 67%, 1)",
      "tab_loading": "hsla(220, 70%, 78%, 1)",
      "tab_loading_inactive": "hsla(220, 70%, 78%, 1)",
      "tab_selected": "hsla(220, 78%, 11%, 1)",
      "tab_text": "hsla(0, 0%, 100%, 1)",
      "toolbar": "hsla(234, 90%, 19%, 1)",
      "toolbar_bottom_separator": "hsla(234, 72%, 12%, 1)",
      "toolbar_field": "hsla(234, 72%, 12%, 1)",
      "toolbar_field_border": "hsla(220, 69%, 66%, 1)",
      "toolbar_field_focus": "hsla(220, 78%, 11%, 1)",
      "toolbar_field_text": "hsla(0, 0%, 100%, 1)",
      "toolbar_text": "hsla(0, 0%, 100%, 1)",
      "toolbar_field_text_focus": "hsla(0, 0%, 100%, 1)",
      "toolbar_field_highlight_text": "hsla(0, 0%, 100%, 1)",
      "toolbar_top_separator": "hsla(220, 69%, 66%, 1)",
      "panel_separator": "hsla(220, 69%, 66%, 1)"
    },
    "properties": {
      "color_scheme": "dark",
      "content_color_scheme": "dark"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{750fa518-b61f-4068-9974-330dcf45442f}"
    }
  }
}