"firefox --version" problem when run via snap

This is Ubuntu 21.10 on x86-64. The "firefox" command is /snap/bin/firefox, which is a symlink to /usr/bin/snap. I am running snapd 2.53+21.10ubuntu1.

When I run the shell command "firefox --version", and attempt to debug the resulting mess a bit, I see the following:

$ firefox --version
/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.utf8)
/bin/bash: /home/eggert/.bashrc: Permission denied
Mozilla Firefox 96.0.3
$ ls -l $HOME/.bashrc
-r--r--r-- 1 eggert eggert 420 Apr 25 2002 /home/eggert/.bashrc
$ env | grep en_US.utf8
LC_ALL=en_US.utf8
$ locale
LANG=C
LANGUAGE=
LC_CTYPE="en_US.utf8"
LC_NUMERIC="en_US.utf8"
LC_TIME="en_US.utf8"
LC_COLLATE="en_US.utf8"
LC_MONETARY="en_US.utf8"
LC_MESSAGES="en_US.utf8"
LC_PAPER="en_US.utf8"
LC_NAME="en_US.utf8"
LC_ADDRESS="en_US.utf8"
LC_TELEPHONE="en_US.utf8"
LC_MEASUREMENT="en_US.utf8"
LC_IDENTIFICATION="en_US.utf8"
LC_ALL=en_US.utf8

As you can see, I do have a .bashrc file. This file is not executable and it shouldn't be executable as it's not intended to be a standalone command. It has worked just fine for decades, when I log in via Bash or run Bash in the usual way.

For what it's worth, the command /snap/firefox/912/usr/lib/firefox/firefox works fine:

$ /snap/firefox/912/usr/lib/firefox/firefox --version
Mozilla Firefox 96.0.3