[Bug 1711337] Re: Firefox crashes at start on armv7L after 55.0.1 update

[James Donald]

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.

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Title:
  Firefox crashes at start on armv7L after 55.0.1 update

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