How to run GNU Emacs 28 in firejail with the firefox profile?

I'd like to be able to run GNU Emacs 28 from a Firefox running in firejail, but it gives the following error:

emacs: could not load dump file "/usr/libexec/emacs/28.1/x86_64-linux-gnu/emacs.pdmp": Permission denied

because of

$ ls -ld /usr/libexec
dr-------- 2 nobody nogroup 40 2022-08-22 18:05:49 /usr/libexec

The following lines in my ~/.config/firejail/firefox-common.local file do not solve the problem:

ignore blacklist /usr/libexec
noblacklist /usr/libexec
whitelist /usr/libexec/emacs

(and whitelist /usr/libexec gives an error). Any idea? **EDIT:** An a workaround to the /usr/libexec issue, I can add noblacklist /usr/libexec to ~/.config/firejail/firefox.local since it is run earlier, but the goal is to add everything to ~/.config/firejail/firefox-common.local since it is more general (run by more profiles), in case I would want to use a different web browser profile.