Site/URL permissions in ManifestV3 use a separate key: host_permissions “host_permissions”: [ “*://*.example.org/” ], “permissions”: [ “storage” ], More info in the official migration guide, make sure to study it.
Use the validators package: >>> import validators >>> validators.url(“http://google.com”) True >>> validators.url(“http://google”) ValidationFailure(func=url, args={‘value’: ‘http://google’, ‘require_tld’: True}) >>> if not validators.url(“http://google”): … print “not valid” … not valid >>> Install it from PyPI with pip (pip install validators).