Firefox, Thunderbird seg fault, give fontconfig warning

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https://bbs.archlinux.org – Hallo,Since I ran updates yesterday, Firefox and Thunderbird (versions don't matter) won't start. I get this error when attempting to open either one:Fontconfig warning: "/etc/fonts/conf.d/50-user.conf", line 9: reading configurations from ~/.fonts.conf is deprecated. Segmentation fault (core dumped)I looked at the wiki (https://wiki.archlinux.org/index.php/Fo … figuration) and I know Fontconfig has changed, but I don't really know what to do to fix it, what I have to edit, and etc, since I don't know what this whole $XDG_CACHE thing is or how to get to it, sinc (HowTos)