It even works on Firefox 48.0 (the "uncompatible" sign isn't true, fix it pls)

unfortunately there is no ability to copy as a plain text
eg. if i set action: Copy Links to Clipboard and select links on this page
Clint Priest, Tommi Rautava and then paste them to excel or word instead url i get Clint Priest, Tommi Rautava.

i suggest add some hotkey or options to copy links as plain text so result after paste to excel would be plain text
https://addons.mozilla.org/sk/firefox/user/cpriest/
https://addons.mozilla.org/sk/firefox/user/rautava/