Moodle Completely Freezes Mac Using Safari

My Mac mini (late 2014) has suddenly started freezing, and I can only shut it down with a hard reset, using on/off button on rear. I can do nothing else. This is when I launch the Moodle website with Safari. Moodle is used by my University for submitting assignments, among other things. Only happens with Safari. Happens every time. Only started happening recently. Had no problems with it previously.

Tried using Chrome, didn't have a problem.

OS 11.2.3

Safari Version is: 14.0.2