Examine source code of Say Cheeeese!!!

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Say Cheeeese!",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(202, 175, 35, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(15, 130, 127)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(222, 171, 0, 0.64)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(211, 169, 41)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgba(255, 199, 0, 0.88)",
      "button_background_hover": "rgb(232, 119, 21)",
      "ntp_background": "rgba(221, 213, 218, 0.18)",
      "popup_border": "rgba(255, 201, 0, 0.78)",
      "sidebar_border": "rgba(169, 116, 17, 0.72)",
      "sidebar_highlight": "rgba(136, 107, 29, 0.72)",
      "sidebar": "rgb(104, 94, 70)",
      "tab_loading": "rgba(76, 91, 91, 0.5)",
      "tab_selected": "rgba(249, 192, 13, 0.77)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_field_border_focus": "rgba(255, 255, 255, 0.72)",
      "toolbar_field_border": "rgb(255, 200, 0)",
      "toolbar_field_focus": "rgba(215, 185, 31, 0.84)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(181, 131, 26)",
      "toolbar_field_separator": "rgba(255, 241, 0, 0)",
      "toolbar_field_text_focus": "rgba(255, 241, 0, 0)",
      "toolbar_top_separator": "rgba(255, 241, 0, 0)",
      "toolbar_vertical_separator": "rgba(255, 241, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{25bd06cb-cc83-41b4-a000-ae6aa340c51b}"
    }
  }
}