diff --git a/src/ubuntu/install/firefox/install_firefox.sh b/src/ubuntu/install/firefox/install_firefox.sh
index 80c9594..932ffd4 100644
--- a/src/ubuntu/install/firefox/install_firefox.sh
+++ b/src/ubuntu/install/firefox/install_firefox.sh
@@ -176,6 +176,10 @@ else
   firefox -headless -CreateProfile "kasm $HOME/.mozilla/firefox/kasm"
 fi
 
+# Silence Firefox security nag "Some of Firefox's features may offer less protection on your current operating system"
+echo 'user_pref("security.sandbox.warn_unprivileged_namespaces", false);' > $HOME/.mozilla/firefox/kasm/user.js
+chown 1000:1000 $HOME/.mozilla/firefox/kasm/user.js
+
 if [[ "${DISTRO}" == @(oracle8|rockylinux9|rockylinux8|oracle9|rhel9|almalinux9|almalinux8|opensuse|fedora39|fedora40) ]]; then
   set_desktop_icon
 fi