Examine source code of forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "forest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(171, 150, 232, 0)",
      "toolbar_text": "rgb(242, 224, 173)",
      "frame": "rgb(62, 90, 104)",
      "tab_background_text": "rgb(247, 251, 212)",
      "toolbar_field": "rgba(33, 46, 174, 0.06)",
      "toolbar_field_text": "rgb(185, 181, 154)",
      "tab_line": "rgb(133, 165, 2)",
      "popup": "rgba(14, 14, 8, 0.34)",
      "popup_text": "rgb(249, 225, 201)",
      "button_background_active": "rgba(135, 10, 225, 0.59)",
      "button_background_hover": "rgba(225, 219, 5, 0.79)",
      "frame_inactive": "rgba(230, 28, 11, 0.04)",
      "icons_attention": "rgba(15, 194, 155, 0.69)",
      "icons": "rgb(242, 224, 173)",
      "ntp_background": "rgba(3, 3, 0, 0.15)",
      "ntp_text": "rgb(245, 223, 106)",
      "popup_border": "rgba(40, 115, 4, 0.97)",
      "popup_highlight_text": "rgb(34, 236, 181)",
      "popup_highlight": "rgba(9, 248, 177, 0.98)",
      "sidebar_border": "rgba(223, 44, 29, 0.04)",
      "sidebar_highlight_text": "rgba(247, 203, 95, 0.95)",
      "sidebar_highlight": "rgba(8, 120, 236, 0.3)",
      "sidebar_text": "rgba(210, 192, 3, 0.95)",
      "sidebar": "rgb(23, 20, 0)",
      "tab_loading": "rgba(8, 225, 55, 0.97)",
      "tab_selected": "rgba(71, 139, 6, 0.27)",
      "tab_text": "rgb(239, 240, 201)",
      "toolbar_bottom_separator": "rgba(60, 50, 47, 0.11)",
      "toolbar_field_border_focus": "rgba(16, 75, 2, 0.98)",
      "toolbar_field_border": "rgba(1, 78, 71, 0.97)",
      "toolbar_field_focus": "rgba(54, 81, 17, 0)",
      "toolbar_field_highlight_text": "rgba(2, 204, 155, 0.97)",
      "toolbar_field_highlight": "rgba(139, 249, 92, 0.29)",
      "toolbar_field_separator": "rgba(129, 131, 218, 0.95)",
      "toolbar_field_text_focus": "rgba(6, 169, 4, 0.98)",
      "toolbar_top_separator": "rgba(201, 18, 45, 0.17)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02d880a8-dec7-4399-a9db-453e6f39c5c8}"
    }
  }
}