Is Armbian desktop running? Yes? Nice to hear, but when Firefox/Chromium crashes you need to talk with their authors/maintainers: https://support.mozilla.org/bg/, https://www.chromium.org/
Technological problem behind your "simple wish": playing multimedia content within a browser is sadly huge and realization far too expensive for a few people ... like Armbian maintainers. Or 10x this size.
The problem/wish would be long solved if this would be simple, cheap to cover or someone with full of resources (RedHat, Ubuntu, ...) would cover/solve this problem properly.
