new file mode 100644
--- /dev/null
+++ b/python/mozbuild/mozbuild/action/process_install_manifest.py
@@ -0,0 +1,41 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from __future__ import print_function, unicode_literals
+
+import argparse
+from mozpack.copier import FileCopier
+from mozpack.manifests import InstallManifest
+
+
+COMPLETE = 'From {dest}: Kept {existing} existing; Added/updated {updated}; ' \
+    'Removed {rm_files} files and {rm_dirs} directories.'
+
+
+def process_manifest(destdir, *paths):
+    manifest = InstallManifest()
+    for path in paths:
+        manifest |= InstallManifest(path=path)
+
+    copier = FileCopier()
+    manifest.populate_registry(copier)
+    return copier.copy(destdir)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(
+        description='Process install manifest files.')
+
+    parser.add_argument('destdir', help='Destination directory.')
+    parser.add_argument('manifests', nargs='+', help='Path to manifest file(s).')
+
+    args = parser.parse_args()
+
+    result = process_manifest(args.destdir, *args.manifests)
+
+    print(COMPLETE.format(dest=args.destdir,
+        existing=result.existing_files_count,
+        updated=result.updated_files_count,
+        rm_files=result.removed_files_count,
+        rm_dirs=result.removed_directories_count))