The new 7.O.2 version (compatible with new API) is not easy to install (under Linux)
- Download open_with_linux.py at the url moz-extension://f7e4c489-66f7-4d9c-b362-949f39d761c2/native/open_with_linux.py
- chmod +x the open_with_linux.py
- run it
- keep it in the download directory