Examine source code of moz dino 2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "moz dino 2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(221, 221, 221)",
      "frame": "rgb(43, 43, 43)",
      "tab_background_text": "rgb(187, 187, 187)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgb(221, 221, 221)",
      "tab_line": "rgba(228, 63, 10, 0.7)",
      "popup": "rgba(43, 43, 43, 0.7)",
      "popup_text": "rgb(221, 221, 221)",
      "button_background_active": "rgba(228, 63, 10, 0.7)",
      "button_background_hover": "rgba(228, 63, 10, 0.42)",
      "frame_inactive": "rgb(34, 34, 34)",
      "icons_attention": "rgb(228, 63, 10)",
      "icons": "rgba(228, 63, 10, 0.7)",
      "ntp_background": "rgba(43, 43, 43, 0.7)",
      "ntp_text": "rgb(187, 187, 187)",
      "popup_border": "rgba(228, 63, 10, 0.7)",
      "popup_highlight_text": "rgb(221, 221, 221)",
      "popup_highlight": "rgba(228, 63, 10, 0.42)",
      "sidebar_border": "rgba(228, 63, 10, 0.7)",
      "sidebar_highlight_text": "rgb(221, 221, 221)",
      "sidebar_highlight": "rgba(228, 63, 10, 0.42)",
      "sidebar_text": "rgb(221, 221, 221)",
      "sidebar": "rgb(43, 43, 43)",
      "tab_background_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgb(228, 63, 10)",
      "tab_selected": "rgb(0, 0, 0)",
      "tab_text": "rgb(221, 221, 221)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0)",
      "toolbar_field_border_focus": "rgba(228, 63, 10, 0.42)",
      "toolbar_field_border": "rgba(0, 0, 0, 0)",
      "toolbar_field_focus": "rgba(43, 43, 43, 0.7)",
      "toolbar_field_highlight_text": "rgb(187, 187, 187)",
      "toolbar_field_highlight": "rgba(228, 63, 10, 0.42)",
      "toolbar_field_separator": "rgba(0, 0, 0, 0)",
      "toolbar_field_text_focus": "rgba(228, 63, 10, 0.42)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "toolbar_vertical_separator": "rgba(0, 0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{556446ef-c56d-45f7-8655-78e0cac10c5e}"
    }
  }
}