This will override some CSS rules on Facebook to make it more readable for people with poor eyesight or overly high pixel densities. I made this because typical browser magnification systems will stretch icons/images into pixelated messes.
Tested on Chrome; it might also work under GreaseMonkey in Firefox. Or not.
It is a total hack and I make no claims about its elegance or the likelihood that it will continue to work over time.
Inspired by and tweaked from User script to disable submit-on-enter.