Rated 3 out of 5 stars

by TBLim on May 20, 2021 · permalink

MacOS 11.4; Thunderbird 78.10.2

After executing
chmod u+x open_with_mac.py
./open_with_mac.py install

Copy the file "open_with.json" from /Users/username/Library/Application Support/Mozilla/NativeMessagingHosts/
to
/Library/Application Support/Mozilla/NativeMessagingHosts/

then Thunderbird and all the browsers can detect it with "Test Installation"!