Comment 50 for bug 1711337

Thanks for trying that, Lars. libfontconfig 2.11 vs 2.12 should be compatible so you could force it to ignore the dependency or run in a sandbox dir without installing. For example: ar xv firefox_58.0.2+build1-0ubuntu1_armhf.deb; tar xvf data.tar.xz; cd ./usr/lib/firefox; ./firefox

This gave me the idea that this could even be tested on Ubuntu MATE 16.04, so I tried that. The only other dependency I had to unpack locally was gcc-7 libstdc++6: https://launchpad.net/ubuntu/bionic/armhf/libstdc++6/7.3.0-1ubuntu1

Unfortunately this gcc-7 build crashes on the same misaligned instruction, so that dashes hopes of resolving this merely with a newer toolchain.