Screenshot: https://bug1257709.bmoattachments.org/attachment.cgi?id=8731947 Sample website: http://jeff.ecchi.ca This website uses the Droid Sans fonts, but somehow Firefox I had originally filed a bug on Firefox at https://bugzilla.mozilla.org/show_bug.cgi?id=1257709 but from what I can see now this is actually a bug that is specific to Fedora—either Fedora's version of Firefox, or Fedora's version of the Google Droid fonts: - The issue does not occur on Firefox on other OSes (OpenSUSE Tumbleweed, Ubuntu, Mac OS X). - The issue does not occur if you do "dnf remove google-droid*"
I can confirm this on Fedora 25 with the latest updates. I also have problems with Open Sans.
So maybe something with font rendering (freetype?) itself, or Fedora's Firefox package? Nicolas, any pointers on how we could know with more certainty?
It's almost certainly a bug in the Firefox font handling code Fedora uses a lot of substitution rules in fontconfig, in particular for Droid They've been vetted by the fontconfig upstream maintainer before deployment and haven't changed for years (and the open sans package didn't follow those rules last time I checked leading to problems) However, because they are advanced and complex, they've tripped implementation bugs in apps that do stuff with fonts in the past (for example QT) when upstream didn't implement properly all the fontconfig substitution logic. IIRC Suse and Ubuntu do not push fontconfig as hard as Fedora, so they won't hit the same application bugs.
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