Examine source code of DireFox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "DireFox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(101, 101, 101)",
      "toolbar_text": "rgb(184, 184, 184)",
      "frame": "rgb(66, 66, 66)",
      "tab_background_text": "rgb(106, 106, 106)",
      "toolbar_field": "rgb(69, 69, 69)",
      "toolbar_field_text": "rgb(240, 240, 240)",
      "tab_line": "rgb(200, 133, 0)",
      "popup": "rgb(83, 83, 83)",
      "popup_text": "rgb(160, 160, 160)",
      "button_background_active": "rgb(87, 87, 87)",
      "button_background_hover": "rgb(117, 117, 117)",
      "frame_inactive": "rgb(41, 41, 41)",
      "icons_attention": "rgb(198, 128, 35)",
      "icons": "rgb(168, 168, 168)",
      "ntp_background": "rgb(70, 70, 70)",
      "ntp_text": "rgb(166, 166, 166)",
      "popup_border": "rgb(91, 91, 91)",
      "tab_text": "rgb(225, 225, 225)",
      "toolbar_bottom_separator": "rgb(91, 91, 91)",
      "toolbar_field_border_focus": "rgb(75, 75, 75)",
      "toolbar_field_border": "rgb(75, 75, 75)",
      "toolbar_field_highlight_text": "rgb(111, 73, 0)",
      "toolbar_field_highlight": "rgb(198, 128, 35)",
      "toolbar_top_separator": "rgb(79, 79, 79)",
      "tab_loading": "rgb(200, 133, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e305dc86-6a89-4fca-b0fb-373c39c04c75}"
    }
  }
}