Recently purchased M4 Mac Mini and experiencing problems with using firefox web browser to watch movies on Netflix and Youtube; movies get glitchy and choppy from the moment streaming starts. However, audio is fine playing in the background. This problem only occurs while watching movies, no problems with other video contents such as youtube shorts. I have reinstalled Firefox browser a few times to no avail. I have also tried other things such as turning off VPN, removed cookies and review other settings as well as switching between wifi and Cat5 none of which seem to fix the issue.

Thank you in advance for your help.