<i>Locking this thread.</i><br><i>Please continue here: [[/questions/1320369]]</i><br> I am running Ubuntu (via UserLAnd) on a Galaxy Tab S7+. Everything on the system has been upgraded to current. When I start Firefox, every tab that opens crashes (even the crash report tab). When I look at the command line, I see: pbrown@localhost:~$ firefox [31977, Main Thread] WARNING: read-only dup failed (Permission denied); not using memfd: file /build/firefox-aGHZQJ/firefox-84.0.2+build1/ipc/chromium/src/base/shared_memory_posix.cc:243 (/usr/lib/firefox/firefox:32065): Pango-WARNING **: 19:10:23.135: failed to create cairo scaled font, expect ugly output. the offending font is 'DejaVu Sans 9.9990234375' (/usr/lib/firefox/firefox:32065): Pango-WARNING **: 19:10:23.135: font_face status is: file not found ... and a lot more of the same. I did a little reading and it looks like there's an issue with the sandbox on the ARM64 architecture, but I'm not sure how to address it. Any suggestions?