diff --git a/lib/clean/dev.sh b/lib/clean/dev.sh
index 869d1cc..bb519e7 100644
--- a/lib/clean/dev.sh
+++ b/lib/clean/dev.sh
@@ -131,7 +131,23 @@ clean_dev_frontend() {
     safe_clean ~/.cache/prettier/* "Prettier cache"
 }
 # Mobile dev caches (can be large).
+# Check for multiple Android NDK versions.
+check_android_ndk() {
+    local ndk_dir="$HOME/Library/Android/sdk/ndk"
+    if [[ -d "$ndk_dir" ]]; then
+        local count
+        count=$(find "$ndk_dir" -mindepth 1 -maxdepth 1 -type d 2> /dev/null | wc -l | tr -d ' ')
+        if [[ "$count" -gt 1 ]]; then
+            note_activity
+            echo -e "  Found ${GREEN}${count}${NC} Android NDK versions"
+            echo -e "  You can delete unused versions manually: ${ndk_dir}"
+        fi
+    fi
+}
+
 clean_dev_mobile() {
+    check_android_ndk
+
     if command -v xcrun > /dev/null 2>&1; then
         debug_log "Checking for unavailable Xcode simulators"
         if [[ "$DRY_RUN" == "true" ]]; then
diff --git a/lib/clean/user.sh b/lib/clean/user.sh
index 950571e..f5dac2e 100644
--- a/lib/clean/user.sh
+++ b/lib/clean/user.sh
@@ -5,6 +5,9 @@ clean_user_essentials() {
     start_section_spinner "Scanning caches..."
     safe_clean ~/Library/Caches/* "User app cache"
     stop_section_spinner
+    start_section_spinner "Scanning empty items..."
+    clean_empty_library_items
+    stop_section_spinner
     safe_clean ~/Library/Logs/* "User app logs"
     if is_path_whitelisted "$HOME/.Trash"; then
         note_activity
@@ -14,6 +17,19 @@ clean_user_essentials() {
     fi
 }
 
+clean_empty_library_items() {
+    local -a empty_dirs=()
+    while IFS= read -r -d '' dir; do
+        [[ -d "$dir" ]] && empty_dirs+=("$dir")
+    done < <(find "$HOME/Library" -mindepth 1 -maxdepth 1 -type d -empty -print0 2> /dev/null)
+
+    if [[ ${#empty_dirs[@]} -gt 0 ]]; then
+        safe_clean "${empty_dirs[@]}" "Empty Library folders"
+    fi
+
+    # Empty file cleanup is skipped to avoid removing app sentinel files.
+}
+
 # Remove old Google Chrome versions while keeping Current.
 clean_chrome_old_versions() {
     local -a app_paths=(
diff --git a/tests/scripts.bats b/tests/scripts.bats
index 3629b72..6cab9ea 100644
--- a/tests/scripts.bats
+++ b/tests/scripts.bats
@@ -71,3 +71,10 @@ setup() {
     run bash -c "grep -q 'write_raycast_script' '$PROJECT_ROOT/scripts/setup-quick-launchers.sh'"
     [ "$status" -eq 0 ]
 }
+
+@test "install.sh supports dev branch installs" {
+    run bash -c "grep -q 'refs/heads/dev.tar.gz' '$PROJECT_ROOT/install.sh'"
+    [ "$status" -eq 0 ]
+    run bash -c "grep -q 'MOLE_VERSION=\"dev\"' '$PROJECT_ROOT/install.sh'"
+    [ "$status" -eq 0 ]
+}
diff --git a/tests/tmp-clean-home.AKSUWT/.m2/repository/org/example/lib.jar b/tests/tmp-clean-home.AKSUWT/.m2/repository/org/example/lib.jar
deleted file mode 100644
index 14cc903..0000000
--- a/tests/tmp-clean-home.AKSUWT/.m2/repository/org/example/lib.jar
+++ /dev/null
@@ -1 +0,0 @@
-dependency
diff --git a/tests/tmp-clean-home.AKSUWT/bin/tmutil b/tests/tmp-clean-home.AKSUWT/bin/tmutil
deleted file mode 100755
index dfbf767..0000000
--- a/tests/tmp-clean-home.AKSUWT/bin/tmutil
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/bash
-if [[ "$1" == "status" ]]; then
-    cat << 'TMUTIL_OUTPUT'
-Backup session status:
-{
-    ClientID = "com.apple.backupd";
-    Running = 1;
-}
-TMUTIL_OUTPUT
-elif [[ "$1" == "destinationinfo" ]]; then
-    cat << 'DEST_OUTPUT'
-====================================================
-Name          : TestBackup
-Kind          : Local
-Mount Point   : /Volumes/TestBackup
-ID            : 12345678-1234-1234-1234-123456789012
-====================================================
-DEST_OUTPUT
-fi
diff --git a/tests/user_clean_core.bats b/tests/user_clean_core.bats
index 148e51a..6aaa5bd 100644
--- a/tests/user_clean_core.bats
+++ b/tests/user_clean_core.bats
@@ -102,3 +102,19 @@ EOF
 
     [ "$status" -eq 0 ]
 }
+
+@test "clean_empty_library_items only cleans empty dirs" {
+    run env HOME="$HOME" PROJECT_ROOT="$PROJECT_ROOT" /bin/bash --noprofile --norc <<'EOF'
+set -euo pipefail
+source "$PROJECT_ROOT/lib/core/common.sh"
+source "$PROJECT_ROOT/lib/clean/user.sh"
+safe_clean() { echo "$2"; }
+mkdir -p "$HOME/Library/EmptyDir"
+touch "$HOME/Library/empty.txt"
+clean_empty_library_items
+EOF
+
+    [ "$status" -eq 0 ]
+    [[ "$output" == *"Empty Library folders"* ]]
+    [[ "$output" != *"Empty Library files"* ]]
+}