Examine source code of Simple Fox Light

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Simple Fox Light",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(239, 240, 241, 0)",
      "toolbar_text": "rgb(35, 38, 41)",
      "frame": "rgb(239, 240, 241)",
      "tab_background_text": "rgb(35, 38, 41)",
      "toolbar_field": "rgba(239, 240, 241, 0)",
      "toolbar_field_text": "rgb(35, 38, 41)",
      "tab_line": "rgb(232, 111, 37)",
      "popup": "rgb(239, 240, 241)",
      "popup_text": "rgb(35, 38, 41)",
      "ntp_text": "rgb(255, 255, 255)",
      "tab_selected": "rgb(232, 111, 37)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(239, 240, 241, 0)",
      "toolbar_top_separator": "rgba(239, 240, 241, 0)",
      "toolbar_vertical_separator": "rgba(239, 240, 241, 0)",
      "tab_loading": "rgb(232, 111, 37)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{37ae8323-c6b2-489e-a3df-287b62a20332}"
    }
  }
}