Rated 5 out of 5 stars
Usable with FF57 at the condition to use an extension like All downloader professional (https://addons.mozilla.org/fr/firefox/addon/all-downloader-professional/?src=api) then it's easy to copy videos urls and paste them into xdm. Much better (faster and multiple DLs) than using the standard downloading tool provided by Firefox.
Thanks a lot to the creator (s) of this module.
For now it's impossible to use the browser monitoring with FF57, but may be in the future ?