It doesn't look to be the same bug. The webpage loads fine, I can scroll down at first, but suddenly, it starts the behaviour described.
The trembling is like the webpage is suddenly connected to a vibrator. It goes up and down a few pixels at a high fequency, for a short period (about 1s). after that, the webpage is still again, until I pres it again to scroll or to hit a link, then it makes the trembling movement again.
It looks like the scroll animation crashes.
It only becomes black after touching an other UI element (not in the content screen).
I'll try with aurora and nightly, but as I only get it after a long time browsing, you need to give me some time.