ok, I disabled unveil by renaming all unveil* files and creating new files that 
contain only "# disable". the issue persists though. another hint: libmozav* 
files in /usr/local/lib/tor-browser have the extension .7.0. those in 
/usr/local/lib/firefox-esr, have the extension 9.0. maybe that's the reason.

Jan 13, 2023, 14:26 by s...@spacehopper.org:

> On 2023/01/13 13:30, onatinadr...@tutanota.com wrote:
>
>> before installing ffmpeg, both tor-browser and firefox-esr play
>> youtube videos with sound. after installing ffmpeg, firefox-esr
>> plays videos on other sites too but tor-browser does not. it
>> shows a warning that I need to install codecs. I wonder if it's
>> an unveil issue. I would try disabling unveil for tor-browser
>> but I couldn't find any documentation on how to disable unveil
>>
>
> Should be same as firefox, but in /etc/tor-browser instead.
>

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