Whenever I play any video in firefox (version 75.0, 64 bit) the video is muted for the first two seconds. Then the sound comes back, and I have to rewind to listen to see what I missed. I'm not sure when exactly this started, but I think it was like this for about a month. Maybe two. I searched for the solution in DuckDuckGo, but couldn't find anything. I did turn off fade-in and fade-out effects but that did not help.

I feel it is some kind of option to avoid sudden audio pop-ins or something. But so far I couldn't find anything relevant in about:config or the browser options.