Firefox cannot open "libgtk-3.so.0". How to circumvent?
Problem solved minutes after asking the question.
Simply run:
yum info gtk3Check if gtk3 is installed. If not:
yum install gtk3My old instance had gtk3 version 3.22.10 installed. My new instance had the same available but not installed. I don't recall seeing this in any of the guides to running firefox headlessly, but a search result that I did not originally think worth checking was able to resolve this rather quickly. Credit to the folks at https://forums.fedoraforum.org/showthread.php?310652-Udating-Firefox-fedora-19
For Ubuntu or Debian distros use:
apt-get install packagekit-gtk3-module
You probably installed the wrong firefox version for 32bit on a 64bit system.
try downloading firefox with this portable installer download-mozilla-portable.sh which should work on a 64bit linux (tested in Ubuntu 19.10)