i3-config-and-scripts/layouts/Browsing.json

// vim:ts=4:sw=4:et
{
    // tabbed split container with 2 children
    "border": "normal",
    "floating": "auto_off",
    "layout": "tabbed",
    "percent": null,
    "type": "con",
    "nodes": [
        {
            "border": "normal",
            "current_border_width": 2,
            "floating": "auto_off",
            "geometry": {
               "height": 729,
               "width": 679,
               "x": 0,
               "y": 0
            },
            "name": "untrusted: Firefox",
            "percent": 0.5,
            "swallows": [
               {
                "class": "^untrusted\\:Firefox$",
                "instance": "^untrusted\\:Navigator$"
               }
            ],
            "type": "con"
        },
        {
            "border": "normal",
            "current_border_width": 2,
            "floating": "auto_off",
            "geometry": {
               "height": 354,
               "width": 543,
               "x": 0,
               "y": 0
            },
            "name": "work-pub: Firefox",
            "percent": 0.5,
            "swallows": [
               {
                "class": "^work\\-pub\\:Firefox$",
                "instance": "^work\\-pub\\:Navigator$"
               }
            ],
            "type": "con"
        }
    ]
}