Bug#1004112: libunwind-13-dev: Issues when replacing libunwind-dev

libgstreamer1.0-dev is not installing due to this bug.

Bug#998679:

Hi All, This bug has already been discussed and fixed in the mainline firefox packages (https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=998108). The discussion even includes a one-liner for hex-editing the binary to fix the freezing. Any reason why this fix cannot be backported to the firefox-e