ffreszoom
ffreszoom (name shamelessly stolen from the Chome equivalent, reszoom) is a Firefox extention that sets zoom level based on screen resolution. The main use case is Linux X11 setups with more than one screen, where one screen's DPI is much higher than the other. ffreszoom zooms to 200% on the HiDPI screen to work around X11's poor mixed DPI handling.