I've used pycookiecheat successfully with Chrome on Ubuntu: https://pypi.org/project/pycookiecheat/

    chr_cookies = pycookiecheat.chrome_cookies('https://example.com')
    session = requests.Session()
    for k, v in cookies.items():
        session.cookies.set(k, v, domain='.example.com')

It’s open source so you could theoretically pull it out and generalize it… idk if anyone wants to manage that project (seems like a ton of work even for an open source project) but I’m sure it be interesting.

There's https://github.com/richardpenman/browsercookie. Also at least for firefox it's quite easy to implement in like 5 strings or so.