diff --git a/apps/m9zCtrlTty/firefox_install.go b/apps/m9zCtrlTty/firefox_install.go
index 9d51d01..ab6075c 100644
--- a/apps/m9zCtrlTty/firefox_install.go
+++ b/apps/m9zCtrlTty/firefox_install.go
@@ -46,6 +46,10 @@ var forbiddenFirefoxDebPackages = map[string]struct{}{
 	"util-linux":   {},
 }
 
+var optionalFirefoxDebPackages = map[string]string{
+	"lubuntu-icon-theme": "theme package may conflict with existing adwaita-icon-theme-full and is not required by Firefox",
+}
+
 type firefoxBundleInstallPlan struct {
 	TotalPackageCount  int
 	HasFirefoxPackage  bool
@@ -94,6 +98,8 @@ func installFirefox() error {
 		return err
 	}
 	baseSystemPackages := strings.Join(plan.BaseSystemPackages, " ")
+	optionalSkipPackages := strings.Join(optionalFirefoxDebPackageNames(), " ")
+	kioskInfof("firefox install package filter baseSystemPackages=%q optionalSkipPackages=%q", baseSystemPackages, optionalSkipPackages)
 
 	var p struct {
 		DebPkgPath       string `json:"DebPkgPath"`
@@ -129,9 +135,11 @@ echo ""
 
 echo "3. filter Firefox deb packages..."
 base_system_packages=%s
+optional_skip_packages=%s
 mkdir -p /opt/firefox-installable
 selected_count=0
 skipped_installed_count=0
+skipped_optional_count=0
 selected_missing_base_count=0
 selected_regular_count=0
 firefox_selected=0
@@ -170,6 +178,14 @@ for deb in /opt/firefox-deb/*.deb; do
     continue
   fi
 
+  case " $optional_skip_packages " in
+    *" $pkg "*)
+      echo "skip optional package: $file package=$pkg"
+      skipped_optional_count=$((skipped_optional_count + 1))
+      continue
+      ;;
+  esac
+
   case " $base_system_packages " in
     *" $pkg "*)
       if [ "$installed" -eq 1 ]; then
@@ -193,7 +209,7 @@ for deb in /opt/firefox-deb/*.deb; do
   select_deb
   selected_regular_count=$((selected_regular_count + 1))
 done
-echo "selected packages: $selected_count, selected missing base: $selected_missing_base_count, selected regular: $selected_regular_count, skipped installed: $skipped_installed_count"
+echo "selected packages: $selected_count, selected missing base: $selected_missing_base_count, selected regular: $selected_regular_count, skipped installed: $skipped_installed_count, skipped optional: $skipped_optional_count"
 if [ "$selected_count" -eq 0 ]; then
   echo "error: no packages selected for install"
   exit 1
@@ -205,7 +221,12 @@ fi
 echo ""
 
 echo "4. install selected Firefox packages..."
-cd /opt/firefox-installable && sudo dpkg -i ./*.deb || { echo "error: install selected Firefox deb packages failed"; exit 1; }
+cd /opt/firefox-installable || { echo "error: enter installable package directory failed"; exit 1; }
+install_status=0
+sudo dpkg -i ./*.deb || install_status=$?
+if [ "$install_status" -ne 0 ]; then
+  echo "warning: selected Firefox deb package install returned status $install_status, verify Firefox next"
+fi
 echo ""
 
 echo "5. verify Firefox..."
@@ -213,7 +234,7 @@ firefox --version || { echo "error: Firefox verification failed"; exit 1; }
 echo ""
 
 echo "=== Firefox install complete ==="
-`, shellQuote(bundlePath), shellQuote(baseSystemPackages)))
+`, shellQuote(bundlePath), shellQuote(baseSystemPackages), shellQuote(optionalSkipPackages)))
 	command.Stdout = os.Stdout
 	command.Stderr = os.Stderr
 
@@ -351,6 +372,15 @@ func unsafeFirefoxDebPackages(packages []string) []string {
 	return blocked
 }
 
+func optionalFirefoxDebPackageNames() []string {
+	names := make([]string, 0, len(optionalFirefoxDebPackages))
+	for name := range optionalFirefoxDebPackages {
+		names = append(names, name)
+	}
+	sort.Strings(names)
+	return names
+}
+
 func shellQuote(value string) string {
 	return "'" + strings.ReplaceAll(value, "'", "'\\''") + "'"
 }
diff --git a/apps/m9zCtrlTty/firefox_install_test.go b/apps/m9zCtrlTty/firefox_install_test.go
index 20afa89..6ee8feb 100644
--- a/apps/m9zCtrlTty/firefox_install_test.go
+++ b/apps/m9zCtrlTty/firefox_install_test.go
@@ -58,6 +58,14 @@ func TestFirefoxBundleInstallPlanDetectsBasePackages(t *testing.T) {
 	}
 }
 
+func TestOptionalFirefoxDebPackageNames(t *testing.T) {
+	got := optionalFirefoxDebPackageNames()
+	want := []string{"lubuntu-icon-theme"}
+	if !stringSlicesEqual(got, want) {
+		t.Fatalf("optionalFirefoxDebPackageNames() = %v, want %v", got, want)
+	}
+}
+
 func stringSlicesEqual(left []string, right []string) bool {
 	if len(left) != len(right) {
 		return false