there are many drugs that can do that but they have massive side effects ;)
Benzodiazepines, opioids, stimulants, opioid-like substances like carisoprodol (there is a reason why people call it Soma). these are the first that come to my mind. contrary to popular belief, downers often give you euphoria.
oh yeah I love your project. I just mentioned patchright cause it's more universal - a drop-in for playwright and also used by browser-use
pydoll is also a fantastic project, but, again, chromium: https://github.com/autoscrape-labs/pydoll