launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Firefox",
            "type": "firefox",
            "request": "launch",
            "preLaunchTask": "server",
            "url": "http://127.0.0.1:8080",
            "webRoot": "${workspaceFolder}"
        },
        {
            "name": "Chrome",
            "type": "chrome",
            "request": "launch",
            "preLaunchTask": "server",
            "url": "http://127.0.0.1:8080",
            "webRoot": "${workspaceFolder}",
            "runtimeExecutable": "/usr/bin/chromium"
        },
        {
            "name": "Electron",
            "type": "node",
            "request": "launch",
            "cwd": "${workspaceRoot}",
            "program": "${workspaceRoot}/index.js",
            "runtimeExecutable": "${workspaceRoot}/node_modules/.bin/electron"
        }
    ]
}