Hi All,

I happened to notice that Firefox is having more and more USE flags for using 
system-side rather than bundled in libraries:

[ebuild     U  ] www-client/firefox-38.3.0::gentoo [38.2.1::gentoo] USE="dbus 
gmp-autoupdate jemalloc3 jit minimal -bindist -custom-cflags -custom-
optimization -debug -egl -gstreamer -gstreamer-0 -hardened (-neon) (-pgo) -
pulseaudio (-selinux) -startup-notification -system-cairo -system-icu -system-
jpeg -system-libvpx -system-sqlite {-test} -wifi"


However, such libraries are not enabled by default and FF will be downloading 
177,578 KiB of sources.  A couple of questions:

- Will FF be downloading less if the system side USE flags are enabled?
- What are the benefits or disbenefits of enabling them?

-- 
Regards,
Mick