Examine source code of Retex 2

{
  "manifest_version": 2,
  "version": "3",
  "name": "retex-2-0923",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(85, 85, 83, 0.59)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(204, 199, 199)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(150, 185, 174, 0.84)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(252, 252, 252)",
      "popup": "rgb(172, 174, 174)",
      "popup_text": "rgb(0, 0, 0)",
      "button_background_active": "rgb(110, 136, 128)",
      "button_background_hover": "rgb(120, 150, 141)",
      "frame_inactive": "rgba(255, 255, 255, 0.74)",
      "icons_attention": "rgb(28, 212, 63)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgba(57, 57, 57, 0.81)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(255, 255, 255)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(38, 38, 41)",
      "sidebar_border": "rgb(255, 255, 255)",
      "sidebar_highlight_text": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgb(150, 185, 174)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(85, 85, 83)",
      "tab_background_separator": "rgba(238, 235, 238, 0.51)",
      "tab_loading": "rgb(28, 212, 63)",
      "tab_selected": "rgba(197, 206, 197, 0.75)",
      "tab_text": "rgb(0, 0, 0)",
      "toolbar_bottom_separator": "rgb(147, 145, 143)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0.47)",
      "toolbar_field_border": "rgb(255, 255, 255)",
      "toolbar_field_focus": "rgb(159, 193, 183)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(240, 247, 241)",
      "toolbar_field_separator": "rgb(255, 255, 255)",
      "toolbar_field_text_focus": "rgb(0, 0, 0)",
      "toolbar_top_separator": "rgb(147, 145, 143)",
      "toolbar_vertical_separator": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7ab23f85-8552-48c1-94f9-ca7e43b38f57}"
    }
  }
}