[lxgr]

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

[justin_dash]

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

[lxgr]

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

[justin_dash]

Unfortunately I'm using Chrome still.