It was pretty straight forward to do, specially thanks that all vibe coding apps have iframes with the dev sites, so it's easy to get the url. Also, funny enough, they are generally served with a token param, that is perfect to use externally as in our case: to vibe e2e test the app.
But... obviously it might get flaky if they change something, probably need to vibe Qa the vibe QA :D
Repo for the extension here https://github.com/desplega-ai/vibe-qa-extension