How to reproduce

1. Go to display preferences — https://secure.phabricator.com/settings/panel/display/
2. Add a font name with dots

Expected behavior
To have the font enabled with the filtering used by Phabricator. Or to have Phabricator write the font name as is, without filtering

Current behavior
The dots are stripped from the name. The font so is ignored.
(tested on Firefox 33.0a2)