Nah, just be patient and wait the 5s. They are trying to create an artificial problem to try to make users switch to their garbage Chrome browser. When they see that Firefox users are smarter and don't give a shit about their stupid tactics, or even better, use different apps like FreeTube to see the videos, they will stop. Either that or destroy the platform.

I wait the 5 secs, don't bother me at all. It's not like they are an ad... :D