Absolutely superb! Simple, clean interface. Does exactly what it says it will. Compatible with Firefox 57. I use this to save my copious tab URLs before Firefox crashes, and I put the URLs into a text file that I always keep so I can go back and find historical tab URLs as well. I use Title&URL, which puts them together with one blank line between them. You can also select Only Web so that it doesn't save the html files held locally on your computer.
I've used it to replace Send Tab URLs (which is now not compatible with Firefox 57).
Thank you Michele Pezza for this excellent add-on. Hurrah!