The default Android Browser on 4.4.4 is ancient. Do not use it. Instead, download Firefox Browser from the Play Store (the last KitKat-compatible version is still available).
How to get it:
Downloading APKs from third-party sites carries a risk. Only download from reputable archives. Download Youtube Android 4.4.4
🛠️ NewPipe is a popular third-party YouTube client. While the main version requires newer Android builds, there are legacy versions available on GitHub or F-Droid designed specifically for older devices. It offers features like background play and no ads. The default Android Browser on 4