Examine source code of forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "forest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(171, 150, 232, 0.04)",
      "toolbar_text": "rgb(242, 224, 173)",
      "frame": "rgb(62, 90, 104)",
      "tab_background_text": "rgb(246, 241, 200)",
      "toolbar_field": "rgba(37, 49, 172, 0.33)",
      "toolbar_field_text": "rgb(185, 181, 154)",
      "tab_line": "rgb(57, 159, 6)",
      "popup": "rgba(28, 34, 25, 0.78)",
      "popup_text": "rgb(226, 221, 254)",
      "button_background_active": "rgba(84, 66, 3, 0.98)",
      "button_background_hover": "rgba(4, 106, 26, 0.98)",
      "frame_inactive": "rgb(208, 12, 225)",
      "icons_attention": "rgba(15, 37, 194, 0.69)",
      "icons": "rgba(236, 230, 225, 0.69)",
      "ntp_background": "rgba(1, 45, 17, 0.69)",
      "ntp_text": "rgb(21, 7, 204)",
      "popup_border": "rgba(13, 128, 227, 0.69)",
      "popup_highlight": "rgba(75, 16, 247, 0.04)",
      "sidebar_border": "rgba(223, 44, 29, 0.04)",
      "sidebar_highlight": "rgba(13, 230, 60, 0.04)",
      "sidebar_text": "rgba(123, 234, 200, 0.69)",
      "sidebar": "rgb(190, 186, 238)",
      "tab_selected": "rgba(15, 49, 40, 0.69)",
      "toolbar_field_border_focus": "rgba(39, 109, 128, 0.97)",
      "toolbar_field_border": "rgb(4, 121, 86)",
      "toolbar_field_focus": "rgba(47, 53, 41, 0.92)",
      "toolbar_field_highlight": "rgba(89, 117, 93, 0.92)",
      "toolbar_field_separator": "rgb(232, 30, 59)",
      "toolbar_field_text_focus": "rgba(133, 238, 156, 0.98)",
      "toolbar_top_separator": "rgba(201, 18, 45, 0.17)",
      "toolbar_vertical_separator": "rgba(238, 164, 56, 0.98)",
      "tab_loading": "rgb(57, 159, 6)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6889814d-e640-44e8-a336-32204b61bd2c}"
    }
  }
}