I've unfortunately had the opposite experience with FF send, I still use it all the time (or try to) when I find links on mobile that I want to read on a big screen, or when I have an image url on my laptop that I want to send from my phone via SMS, snapshat, etc. But the delay is just unbearably long and inconsistent. Sometimes (most often when sending desktop to phone) the delay is 15 minutes or more. I've found it a lot easier to use a bookmarklet that uses DDG to generate qr codes, but that only solved sharing in one direction.

I've wondered how send could be so slow but maybe something in my setup is just killing it. More than anything though, I would love an easy way to access my phone's sharing options from my laptop (perhaps an addon button that shows a list of app intents that can receive a url/page).

This is one thing I'm hoping to hack at when I get my Librem.