diff --git a/.gitignore b/.gitignore
index 919fb81eb9c0..47ff16638659 100644
--- a/.gitignore
+++ b/.gitignore
@@ -174,6 +174,7 @@ lextab.py
 .vscode/
 !.vscode/extensions.json
 !.vscode/tasks.json
+*.user
 
 # Ignore various raptor performance framework files
 testing/raptor/.raptor-venv
diff --git a/.hgignore b/.hgignore
index 3ddb28b20bc5..cd122bc15775 100644
--- a/.hgignore
+++ b/.hgignore
@@ -203,6 +203,7 @@ tps_result\.json
 # Ignore Visual Studio/Visual Studio Code workspace files.
 \.vs/
 \.vscode/(?!extensions\.json|tasks\.json)
+\.user$
 
 # https://bz.mercurial-scm.org/show_bug.cgi?id=5322
 ^comm/
diff --git a/js/src/ctypes/libffi/msvc_build/aarch64/Ffi_staticLib.vcxproj.user b/js/src/ctypes/libffi/msvc_build/aarch64/Ffi_staticLib.vcxproj.user
deleted file mode 100644
index 6e2aec7aefc8..000000000000
--- a/js/src/ctypes/libffi/msvc_build/aarch64/Ffi_staticLib.vcxproj.user
+++ /dev/null
@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup />
-</Project>
\ No newline at end of file