check which our your installed gnome shell extensions are supported in gnome 40 or 40.beta

find_gnome40_exts.py

#!/usr/bin/env python3
import os, json, glob, requests

url = "https://extensions.gnome.org/extension-info/?uuid="
ext_metadata_files = os.environ['HOME'] + "/.local/share/gnome-shell/extensions/**/metadata.json"

for filename in glob.glob(ext_metadata_files):
    with open(filename) as jfile:
        data = json.load(jfile)
        resp = requests.get(url=url+data['uuid'])
        data = resp.json()
        for i in data['shell_version_map']:
            if i == "40" or i == "40.beta":
                print(data['name'], i)