In the meantime, users can use my Link Creator Thunderbird extension, which in addition to URLs, also supports unlinked e-mail addresses and phone numbers: https://addons.thunderbird.net/thunderbird/addon/link-creator/
I have some good news for everyone. While Firefox Send is no longer supported by Mozilla, it is still alive a well. It is now maintained by Tim Visée and called just Send. There are over 15 and counting public Send service instances that people can u...