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[fn]+[up arrow] = pgup, [fn]+[down arrow] = pgdown, [fn]+[left arrow] = home, [fn]+[right arrow] = end

These are impossible to press with just one hand (or the bottom of my coffee cup in a pinch), though.

I use option + up arrow or option + down arrow sometimes, works the same as spacebar to page up / page down.

In which browser? Doesn't work in Firefox, unfortunately.

Unfortunately I'm using Chrome still.