vscode-install-vsix/.vscode/launch.json

Install .vsix extensions right from the explorer, with a right click.

{
  "version": "1.0.0",
  "configurations": [{
    "name": "Launch Extension",
    "type": "extensionHost",
    "request": "launch",
    "runtimeExecutable": "${execPath}",
    "args": ["--extensionDevelopmentPath=${workspaceRoot}" ],
    "stopOnEntry": false,
    "sourceMaps": true,
    "outFiles": [ "${workspaceRoot}/out/src/**/*.js" ],
    "preLaunchTask": "npm"
  }]
}