I've not yet tested patch from comment 165 - but with regards to Firefox and Cairo -  I'm also seeing errors in  i.e. pidgin - where status icons looks occasionally damaged.

And my rawhide has these related packages:

cairo-1.13.1-0.1.git337ab1f.fc21.x86_64
cairo-gobject-1.13.1-0.1.git337ab1f.fc21.x86_64
pidgin-2.10.7-9.fc21.x86_64
xorg-x11-server-Xorg-1.15.0-1.fc21.x86_64
libX11-1.6.1-1.fc20.x86_64


 ldd /bin/pidgin
	linux-vdso.so.1 =>  (0x00007fff323ad000)
	libX11.so.6 => /lib64/libX11.so.6 (0x00007f6f151af000)
	libXext.so.6 => /lib64/libXext.so.6 (0x00007f6f14f9c000)
	libXss.so.1 => /lib64/libXss.so.1 (0x00007f6f14d98000)
	libSM.so.6 => /lib64/libSM.so.6 (0x00007f6f14b90000)
	libICE.so.6 => /lib64/libICE.so.6 (0x00007f6f14973000)
	libgtkspell.so.0 => /lib64/libgtkspell.so.0 (0x00007f6f1476c000)
	libgtk-x11-2.0.so.0 => /lib64/libgtk-x11-2.0.so.0 (0x00007f6f140e7000)
	libgdk-x11-2.0.so.0 => /lib64/libgdk-x11-2.0.so.0 (0x00007f6f13e25000)
	libpangocairo-1.0.so.0 => /lib64/libpangocairo-1.0.so.0 (0x00007f6f13c18000)
	libatk-1.0.so.0 => /lib64/libatk-1.0.so.0 (0x00007f6f139f4000)
	libcairo.so.2 => /lib64/libcairo.so.2 (0x00007f6f136ce000)
	libgdk_pixbuf-2.0.so.0 => /lib64/libgdk_pixbuf-2.0.so.0 (0x00007f6f134aa000)
	libgio-2.0.so.0 => /lib64/libgio-2.0.so.0 (0x00007f6f1312b000)
	libpangoft2-1.0.so.0 => /lib64/libpangoft2-1.0.so.0 (0x00007f6f12f15000)
	libpango-1.0.so.0 => /lib64/libpango-1.0.so.0 (0x00007f6f12cca000)
	libfontconfig.so.1 => /lib64/libfontconfig.so.1 (0x00007f6f12a8e000)
	libfreetype.so.6 => /lib64/libfreetype.so.6 (0x00007f6f127e9000)
	libpurple.so.0 => /lib64/libpurple.so.0 (0x00007f6f124af000)
	libdbus-glib-1.so.2 => /lib64/libdbus-glib-1.so.2 (0x00007f6f12287000)
	libdbus-1.so.3 => /lib64/libdbus-1.so.3 (0x00007f6f1203e000)
	libfarstream-0.1.so.0 => /lib64/libfarstream-0.1.so.0 (0x00007f6f11e29000)
	libgstbase-0.10.so.0 => /lib64/libgstbase-0.10.so.0 (0x00007f6f11bd5000)
	libgstinterfaces-0.10.so.0 => /lib64/libgstinterfaces-0.10.so.0 (0x00007f6f119c2000)
	libgstreamer-0.10.so.0 => /lib64/libgstreamer-0.10.so.0 (0x00007f6f116d9000)
	libgobject-2.0.so.0 => /lib64/libgobject-2.0.so.0 (0x00007f6f11487000)
	libgmodule-2.0.so.0 => /lib64/libgmodule-2.0.so.0 (0x00007f6f11282000)
	libgthread-2.0.so.0 => /lib64/libgthread-2.0.so.0 (0x00007f6f11080000)
	libglib-2.0.so.0 => /lib64/libglib-2.0.so.0 (0x00007f6f10d54000)
	libxml2.so.2 => /lib64/libxml2.so.2 (0x00007f6f109ea000)
	libidn.so.11 => /lib64/libidn.so.11 (0x00007f6f107b7000)
	libm.so.6 => /lib64/libm.so.6 (0x00007f6f104b1000)
	libnsl.so.1 => /lib64/libnsl.so.1 (0x00007f6f10296000)
	libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f6f1007b000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f6f0fe5d000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f6f0fa95000)
	libxcb.so.1 => /lib64/libxcb.so.1 (0x00007f6f0f874000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007f6f0f670000)
	libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f6f0f46a000)
	libenchant.so.1 => /lib64/libenchant.so.1 (0x00007f6f0f25e000)
	libXfixes.so.3 => /lib64/libXfixes.so.3 (0x00007f6f0f058000)
	libXrender.so.1 => /lib64/libXrender.so.1 (0x00007f6f0ee4d000)
	libXinerama.so.1 => /lib64/libXinerama.so.1 (0x00007f6f0ec4a000)
	libXi.so.6 => /lib64/libXi.so.6 (0x00007f6f0ea3a000)
	libXrandr.so.2 => /lib64/libXrandr.so.2 (0x00007f6f0e82f000)
	libXcursor.so.1 => /lib64/libXcursor.so.1 (0x00007f6f0e624000)
	libXcomposite.so.1 => /lib64/libXcomposite.so.1 (0x00007f6f0e421000)
	libXdamage.so.1 => /lib64/libXdamage.so.1 (0x00007f6f0e21d000)
	libharfbuzz.so.0 => /lib64/libharfbuzz.so.0 (0x00007f6f0dfc8000)
	libpixman-1.so.0 => /lib64/libpixman-1.so.0 (0x00007f6f0dd1a000)
	libEGL.so.1 => /lib64/libEGL.so.1 (0x00007f6f0daf7000)
	libpng16.so.16 => /lib64/libpng16.so.16 (0x00007f6f0d8c4000)
	libxcb-shm.so.0 => /lib64/libxcb-shm.so.0 (0x00007f6f0d6c0000)
	libxcb-render.so.0 => /lib64/libxcb-render.so.0 (0x00007f6f0d4b6000)
	libz.so.1 => /lib64/libz.so.1 (0x00007f6f0d2a0000)
	libGL.so.1 => /lib64/libGL.so.1 (0x00007f6f0d037000)
	librt.so.1 => /lib64/librt.so.1 (0x00007f6f0ce2f000)
	libffi.so.6 => /lib64/libffi.so.6 (0x00007f6f0cc26000)
	libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f6f0ca02000)
	libexpat.so.1 => /lib64/libexpat.so.1 (0x00007f6f0c7d7000)
	liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f6f0c5b2000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f6f15521000)
	libXau.so.6 => /lib64/libXau.so.6 (0x00007f6f0c3ad000)
	libgraphite2.so.3 => /lib64/libgraphite2.so.3 (0x00007f6f0c191000)
	libX11-xcb.so.1 => /lib64/libX11-xcb.so.1 (0x00007f6f0bf8e000)
	libxcb-dri2.so.0 => /lib64/libxcb-dri2.so.0 (0x00007f6f0bd89000)
	libxcb-xfixes.so.0 => /lib64/libxcb-xfixes.so.0 (0x00007f6f0bb82000)
	libxcb-shape.so.0 => /lib64/libxcb-shape.so.0 (0x00007f6f0b97d000)
	libgbm.so.1 => /lib64/libgbm.so.1 (0x00007f6f0b775000)
	libwayland-client.so.0 => /lib64/libwayland-client.so.0 (0x00007f6f0b567000)
	libwayland-server.so.0 => /lib64/libwayland-server.so.0 (0x00007f6f0b355000)
	libglapi.so.0 => /lib64/libglapi.so.0 (0x00007f6f0b12e000)
	libudev.so.1 => /lib64/libudev.so.1 (0x00007f6f0af1c000)
	libdrm.so.2 => /home/kabi/soft/glx-test/lib/libdrm.so.2 (0x00007f6f0ad0f000)
	libxcb-glx.so.0 => /lib64/libxcb-glx.so.0 (0x00007f6f0aaf5000)
	libXxf86vm.so.1 => /lib64/libXxf86vm.so.1 (0x00007f6f0a8ee000)
	libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f6f0a687000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f6f0a470000)


So while the Firefox is the easiest one to see those errors (it's always enough to play for a while with some input box), it's probably not tied with its built-in version of Cairo library.