Does this happen in Safari, at the same sites?
Some sites still use Flash. Not installed on a Mac by default
P
I am using an iMac running macOS High Sierra (10.13.6). I use Firefox Quantum, version 62. Online access is through Spectrum. No matter what I do videos will not play. All I ever see is the rotating circle of dots and the video never starts. Anybody got an idea what's going on?