Bug#702198: I confirm the suggested fix addresses the problem

[Asheesh Laroia]

It would be nice if package metadata indicated this conflict.

Regardless, I ran this command and got this output, and my crash went 
away.

$ sudo apt-get install libwebkitgtk-1.0-0/unstable 
libwebkitgtk-3.0-0/unstable libjavascriptcoregtk-3.0-0/unstable

Reading package lists... Done
Building dependency tree
Reading state information... Done
libwebkitgtk-1.0-0 is already the newest version.
Selected version '1.8.1-3.4' (Debian:unstable [amd64]) for 'libwebkitgtk-1.0-0'
Selected version '1.8.1-3.4' (Debian:unstable [amd64]) for 'libwebkitgtk-3.0-0'
Selected version '1.8.1-3.4' (Debian:unstable [amd64]) for 'libjavascriptcoregtk-3.0-0'
The following packages were automatically installed and are no longer required:
   libgstreamer-plugins-base1.0-0 libgstreamer1.0-0
Use 'apt-get autoremove' to remove them.
The following packages will be DOWNGRADED:
   libjavascriptcoregtk-3.0-0 libwebkitgtk-3.0-0
0 upgraded, 0 newly installed, 2 downgraded, 0 to remove and 240 not upgraded.
Need to get 5,760 kB of archives.
After this operation, 3,078 kB disk space will be freed.
Do you want to continue [Y/n]?
Get:1 http://mirror.mit.edu/debian/ sid/main libwebkitgtk-3.0-0 amd64 1.8.1-3.4 [4,755 kB]
Get:2 http://mirror.mit.edu/debian/ sid/main libjavascriptcoregtk-3.0-0 
amd64 1.8.1-3.4 [1,005 kB]
Fetched 5,760 kB in 14s (406 kB/s)
dpkg: warning: downgrading libwebkitgtk-3.0-0 from 1.10.2-2 to 1.8.1-3.4
(Reading database ... 583128 files and directories currently installed.)
Preparing to replace libwebkitgtk-3.0-0 1.10.2-2 (using 
.../libwebkitgtk-3.0-0_1.8.1-3.4_amd64.deb) ...
Unpacking replacement libwebkitgtk-3.0-0 ...
dpkg: warning: downgrading libjavascriptcoregtk-3.0-0 from 1.10.2-2 to 
1.8.1-3.4
Preparing to replace libjavascriptcoregtk-3.0-0 1.10.2-2 (using 
.../libjavascriptcoregtk-3.0-0_1.8.1-3.4_amd64.deb) ...
Unpacking replacement libjavascriptcoregtk-3.0-0 ...
Setting up libjavascriptcoregtk-3.0-0 (1.8.1-3.4) ...
Setting up libwebkitgtk-3.0-0 (1.8.1-3.4) ...