Comment 2 for bug 1459622

Same situation here:
Firefox can't handle ~/.mozilla to be a virtio-9p mount.
Here the subvolume is ext4, mounted only at /home.

I also noticed that chromium is working, but it complains about some errors:
getrlimit(RLIMIT_NOFILE) failed
[4809:4839:0804/230514:ERROR:backend_impl.cc(1365)] Unable to map Index file
[4809:4839:0804/230514:ERROR:backend_impl.cc(1365)] Unable to map Index file
[4809:4840:0804/230514:ERROR:cache_creator.cc(133)] Unable to create cache
[4845:4845:0804/230514:ERROR:sandbox_linux.cc(340)] InitializeSandbox() called with multiple threads in process gpu-process