Make sure you are not blocking content.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

One issue that seems more common lately is Firefox's Content Blocking. When it is blocking content in a page, a shield icon will appear at the left end of the address bar next to the padlock icon. This article has more info on managing this feature:

https://support.mozilla.org/en-US/kb/content-blocking

problem is still save

joker_break said

problem is still save

Hello joker_break,

Google Translate uses Adobe Flash - that plugin doesn't show in your system details ...... (?)

Please see : https://askubuntu.com/questions/1018233/google-translate-audio-button-missing

Also : https://itsfoss.com/install-adobe-flash-player-in-ubuntu-13-04/

And : https://www.wikihow.com/Install-Flash-Player-on-Ubuntu

I don't think that Listen still uses the Flash plugin. I see code to create an AUDIO tag to play an audio file (mp3, ogg, wav) detected via canPlayType().

Do you otherwise have a problem to play audio files?

Make sure you have the latest FFmpeg packages installed.

var b = cu('audio/mpeg') ? 1 : 0,
c = cu('audio/ogg') ? 1 : 0,
d = cu('audio/wav') ? 1 : 0;

var cu = function (a) {
try {
var b = F('AUDIO');
return null != b && null != b.canPlayType && null != b.load && null != b.play && null != b.paused && null != b.pause && 'no' != b.canPlayType(a) && '' != b.canPlayType(a)
} catch (c) {
return !1
}
};

it solved the problem https://askubuntu.com/questions/1035661/playing-videos-in-firefox Thanks all