I have the same experience. And sometimes it's not that they don't work, it's that they work very poorly. The second I switch to a chromium based browser it's fixed. I had huge issues with Google Earth on Firefox, even after I cleared my cookies and cache. Booted up ungoogled chromium and worked fine. Same with YouTube. Kept pausing and loading for absolutely no reason (1gig connection). Switch to chromium? Fine. Just my examples in the past couple days, I've had issues on non Google websites too.