Facebook videos do not run in Opera and Firefox
Solution for Opera:
The devs are very lazy to update the
libffmpeg.so file. Hence use the below method to get it work.
find / -type f -name libffmpeg.so in your system, and replace it the one that you've found with the one that is located on
in my case, I took it from the slack installation and the size is 2.9mb vs the "original" that it size is 1.7mb.