RE: Can't play facebook videos or GIFS in Opera w/Linux Mint
Opera for Linux
Im having the same issues, along with Dailymotion videos not working at all "Try updating your browser, or use a different one".
Also, Nicotine is not working properly. It says theres an error due to Upnp support.
This all came about when I updated to Linux Mint 19. So far, no help from the Update Manager.