I can't download from facebook today, getting a messae ( linlks were not found

I can't download any video from facebook just since today, I get a message ( links were not found) .... Browser: Firefox 47.0 Windows 7 User Agent: Mozilla/5.0 (Windows NT 6.1; rv:47.0) Gecko/20100101 Firefox/47.0 Extension: ff-sf 6.35