When you put about:support
into the Firefox URL bar, do you see evidence that your GPU is being used? I’m not sure which settings, exactly, would indicate that, but mine, under “GPU #1” has “Active: Yes.”
Lots of GPU-related options are also disabled, but I still get a smooth Google Earth experience.
Some of the videos of this are really frustrating to watch. Like, what are you trying to do!? You just found your spot, now you’re coming back out?? More circling, stopping, going back, going forward. Uughghhh…