Examine source code of Grease For Gears

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Grease For Gears",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(183, 151, 88, 0.67)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 180, 0)",
      "popup": "rgba(0, 0, 0, 0.79)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(10, 0, 255)",
      "button_background_hover": "rgba(58, 140, 252, 0.4)",
      "frame_inactive": "rgba(255, 255, 255, 0)",
      "icons_attention": "rgba(0, 32, 255, 0.68)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgba(255, 255, 255, 0)",
      "ntp_text": "rgba(255, 255, 255, 0)",
      "sidebar": "rgb(255, 255, 255)",
      "tab_background_separator": "rgba(0, 28, 255, 0)",
      "tab_loading": "rgba(255, 255, 255, 0)",
      "tab_selected": "rgba(0, 121, 255, 0.35)",
      "toolbar_field_border_focus": "rgba(9, 0, 255, 0)",
      "toolbar_field_border": "rgb(0, 142, 255)",
      "toolbar_field_focus": "rgba(255, 255, 255, 0)",
      "toolbar_field_highlight": "rgba(255, 255, 255, 0)",
      "toolbar_field_separator": "rgba(255, 255, 255, 0)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f0850c3-ee88-4160-a82f-567fd14281ac}"
    }
  }
}