I believe this https://gitlab.com/timvisee/ffsend picks up from Firefox send. It uses CLI, not sure if there’s an extension. There other other CLI tools for sending as well.
this post was submitted on 26 Jun 2023
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Https://datash.co is a really good alternative
Firefox Send was indeed discontinued but being open source the baton was picked up and lives on at Send.
Other options are listed here.