Coincidental, I imagine. The condition can rear it’s ugly head on a cleanly installed Firefox instance (without extensions), and also with chromium-based browsers; though noone in this thread has mentioned it.
However, and as you suggest, it can indeed reveal itself on multiple platforms. For me, it’s been too infrequent to warrant any great investigation as to the actual cause, and the condition doesn’t linger, so I haven’t had much interest; it can still be annoying though.