In your browser, you may have problems on some websites displaying strange fonts. For example, you may have seen the following fonts on Github.
This problem is due to bitmap font.
To deactivate bitmap fonts, you can use existing font configuration files you
can find into
/etc/fonts/conf.avail. To avoid bitmap fonts, you just need to
$ cd /etc/fonts $ ln -s conf.avail/70-no-bitmaps.conf conf.d/
Now, you can restart your X server for this new configuration taking effect.