Examine source code of elfenforest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "elfenforest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(35, 165, 17, 0.54)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(121, 195, 71)",
      "tab_background_text": "rgb(47, 108, 22)",
      "toolbar_field": "rgba(76, 123, 48, 0.12)",
      "toolbar_field_text": "rgb(30, 67, 7)",
      "tab_line": "rgba(223, 225, 219, 0)",
      "popup": "rgba(93, 158, 62, 0.96)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(73, 168, 22, 0.36)",
      "button_background_hover": "rgba(130, 235, 13, 0.05)",
      "frame_inactive": "rgba(103, 240, 34, 0.96)",
      "icons_attention": "rgba(151, 221, 48, 0.98)",
      "icons": "rgba(31, 96, 4, 0.96)",
      "ntp_background": "rgba(2, 53, 2, 0.81)",
      "ntp_text": "rgba(164, 221, 79, 0.98)",
      "popup_border": "rgba(89, 141, 33, 0.76)",
      "popup_highlight_text": "rgba(89, 217, 21, 0.78)",
      "popup_highlight": "rgba(158, 239, 63, 0)",
      "sidebar_border": "rgba(101, 179, 11, 0.05)",
      "sidebar_highlight_text": "rgba(217, 255, 173, 0.05)",
      "sidebar_text": "rgb(117, 195, 63)",
      "tab_background_separator": "rgba(73, 152, 56, 0.42)",
      "tab_loading": "rgba(84, 240, 3, 0.78)",
      "tab_selected": "rgba(45, 193, 4, 0.5)",
      "toolbar_bottom_separator": "rgba(55, 232, 5, 0.97)",
      "toolbar_field_border": "rgba(74, 255, 19, 0.97)",
      "toolbar_field_highlight_text": "rgba(80, 217, 43, 0.97)",
      "toolbar_field_separator": "rgba(87, 255, 37, 0.97)",
      "toolbar_top_separator": "rgba(34, 228, 19, 0.67)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd7ef6aa-f3b1-4e7a-8669-5630c5e5eba9}"
    }
  }
}