diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71ed1ae1..58719cf8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Added warning notifications for extensions that interfere with Modern Fortran
+  ([#458](https://github.com/fortran-lang/vscode-fortran-support/issues/458))
 - Added single file and multiple workspace folder support for the Language Server
   ([#446](https://github.com/fortran-lang/vscode-fortran-support/issues/446))
 - Added file synchronization with VS Code settings and `.fortls` against the Language Server
diff --git a/src/extension.ts b/src/extension.ts
index 41968e20..6b94e44d 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -118,4 +118,21 @@ function detectDeprecatedOptions() {
         loggingService.logError(`The following deprecated options have been detected:\n${oldArgs}`);
       });
   }
+
+  // NOTE: the API for this will probably change in the near future to return true
+  // even if the extension is not activated
+  // see: https://github.com/microsoft/vscode/issues/133734
+  if (vscode.extensions.getExtension('hansec.fortran-ls')) {
+    vscode.window.showWarningMessage(
+      `Modern Fortran is not compatible with FORTRAN Intellisense. 
+      Language Server integration is handled in Modern Fortran now.
+      Please Disable FORTRAN Intellisense.`
+    );
+  }
+  if (vscode.extensions.getExtension('ekibun.fortranbreaker')) {
+    vscode.window
+      .showWarningMessage(`Modern Fortran is not compatible with Fortran Breakpoint Support.
+      Breakpoint support is handled natively in Modern Fortran.
+      Please Disable Fortran Breakpoint Support.`);
+  }
 }