Examine source code of Blackred

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Red & Black",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 4, 8)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 0, 0)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 0, 0)",
      "tab_line": "rgb(255, 0, 4)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(183, 98, 98)",
      "button_background_active": "rgb(83, 78, 78)",
      "button_background_hover": "rgb(172, 66, 66)",
      "frame_inactive": "rgb(89, 85, 85)",
      "icons_attention": "rgb(245, 7, 7)",
      "icons": "rgb(255, 0, 0)",
      "ntp_background": "rgb(0, 0, 0)",
      "ntp_text": "rgb(245, 9, 9)",
      "popup_border": "rgb(6, 6, 6)",
      "popup_highlight_text": "rgb(255, 15, 15)",
      "popup_highlight": "rgb(11, 11, 11)",
      "sidebar_border": "rgb(6, 6, 6)",
      "sidebar_highlight_text": "rgb(247, 240, 240)",
      "sidebar_highlight": "rgb(242, 242, 242)",
      "sidebar_text": "rgb(247, 8, 8)",
      "sidebar": "rgb(7, 7, 7)",
      "tab_background_separator": "rgb(249, 0, 0)",
      "tab_loading": "rgb(10, 10, 10)",
      "tab_selected": "rgb(0, 0, 0)",
      "tab_text": "rgb(245, 7, 7)",
      "toolbar_bottom_separator": "rgb(248, 11, 11)",
      "toolbar_field_border_focus": "rgb(0, 0, 0)",
      "toolbar_field_border": "rgb(244, 3, 3)",
      "toolbar_field_focus": "rgb(7, 7, 7)",
      "toolbar_field_highlight_text": "rgb(244, 3, 3)",
      "toolbar_field_highlight": "rgb(8, 8, 8)",
      "toolbar_field_separator": "rgb(13, 12, 12)",
      "toolbar_top_separator": "rgb(7, 7, 7)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{251edda8-a936-4f83-a188-e4fa70bbb3fd}"
    }
  }
}