Some keyboard-shortcut toggles:
Shift+1: Expand the left-side Friends/Noise panel to take up the whole window. Press again to collapse it to normal size.
Shift+5: Toggle linear layout vs tiled layout. (That is, make the current feed look like either standard Friends view or standard Noise view.)
Shift+0: Toggle the display of follow notifications on or off.
...Not sure whether there's a way to do these things in a mobile browser.