copy paste from irc. 
bits: so as an fyi, whenever icecat begins to depend on libgconf like its predecessor, firefox. be sure to disable it from mozconfig. 
bits: http://lists.linuxfromscratch.org/pipermail/blfs-dev/2015-October/031249.html
bits: because the tor browser is already feeling the weight of it.
bits: https://trac.torproject.org/projects/tor/ticket/18698
bits: Gconf is part of gnome and depends on dbus (sic)
bits: this is probably due to the fact that firefox is depreciating gtk2, so I strongly suggest a transition to IceApe in the future. 
https://bugzilla.mozilla.org/show_bug.cgi?id=1186003
ac_add_options --disable-gconf

Also please add this to the mozconfig aswell:
ac_add_options --disable-webrtc
Mozilla Wiki wrote WebRTC (Web Real-Time Communications) is a technology which enables Web applications and sites to capture and optionally stream audio and/or video media, as well as to exchange arbitrary data between browsers without requiring an intermediary. The set of standards that comprises WebRTC makes it possible to share data and perform teleconferencing peer-to-peer, without requiring that the user install plug-ins or any other third-party software. [0]
[0] https://developer.mozilla.org/en-US/docs/Web/API/WebRTC_API

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