diff --git a/extensions/json/package.json b/extensions/json/package.json
index cca25933dc6fe..a8a1186ec8739 100644
--- a/extensions/json/package.json
+++ b/extensions/json/package.json
@@ -28,10 +28,12 @@
 					".jshintrc",
 					".jscsrc",
 					".eslintrc",
-					".babelrc"
+					".babelrc",
+					".webmanifest"
 				],
 				"mimetypes": [
-					"application/json"
+					"application/json",
+					"application/manifest+json"
 				],
 				"configuration": "./json.configuration.json"
 			}
@@ -131,4 +133,4 @@
 		"vscode-languageclient": "^2.2.1",
 		"vscode-extension-telemetry": "^0.0.5"
 	}
-}
\ No newline at end of file
+}