https://chrome.google.com/webstore/detail/change-colors/jbmk...

http://ethanschoonover.com/solarized

Firefox: about:config > gfx.downloadable_fonts.enabled > false

Chrome: Add --disable-remote-fonts as start parameter

1: http://www.techpowerup.com/forums/showthread.php?t=184198

in Firefox it used to be in one of the menus, something about styles.

i'm not sure if Chrome can do it without a plugin.