Examine source code of River Plate V2

{
  "manifest_version": 2,
  "version": "4.0",
  "name": "River Plate V2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.91)",
      "toolbar_text": "rgb(236, 33, 33)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 0, 0)",
      "button_background_active": "rgb(14, 14, 14)",
      "button_background_hover": "rgb(180, 5, 5)",
      "icons_attention": "rgb(255, 255, 255)",
      "icons": "rgb(241, 0, 0)",
      "ntp_background": "rgba(19, 19, 19, 0.92)",
      "ntp_text": "rgb(255, 0, 0)",
      "popup_border": "rgb(255, 255, 255)",
      "sidebar_border": "rgb(255, 255, 255)",
      "sidebar_text": "rgb(236, 33, 33)",
      "sidebar": "rgb(0, 0, 0)",
      "tab_selected": "rgb(0, 0, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_field_border": "rgb(236, 33, 33)",
      "toolbar_field_highlight_text": "rgba(0, 0, 0, 0.84)",
      "toolbar_field_highlight": "rgb(236, 33, 33)",
      "toolbar_field_text_focus": "rgb(236, 33, 33)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cf986a25-030f-49a7-bd75-62bac9af4e02}"
    }
  }
}