First thank you all for the answers!
Now I solved the problem with firefox:
I updated Firefox to 77
Uninstalled ffmpeg 4
Installed ffmpeg from AlienBob (even being version 3: I was reluctant to use it because of the old version of ffmpeg, but I was wrong)
Restarted Firefox
Now It works fine!
When I tried CFLAGS to compile ffmpeg I received a compiler error and without Cflags I received a error about fPIC
AlienBob package saved my day
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