docs.swarmlab.io/.vscode/launch.json

// flatpak run org.mozilla.firefox --start-debugger-server

{
    "version": "0.2.0",
    "configurations": [{
            "type": "firefox",
            "request": "attach",
            "name": "Attach Firefox",
            "url": "http://127.0.0.1:8080/",
            "webRoot": "${workspaceFolder}",
            "pathMappings": [{
                "url": "http://127.0.0.1:8080",
                "path": "${workspaceFolder}/public"
            }]
        },
        {
            "type": "node",
            "request": "attach",
            "name": "Node: Nodemon",
            "processId": "${command:PickProcess}",
            "restart": true,
            "protocol": "inspector"
        }
    ]
}