diff --git a/check-grammar-crate.py b/check-grammar-crate.py
index 5e59f9536..80312aeca 100755
--- a/check-grammar-crate.py
+++ b/check-grammar-crate.py
@@ -46,7 +46,7 @@
     "tree-sitter-java": ["*.java"],
     "tree-sitter-rust": ["*.rs"],
     "tree-sitter-python": ["*.py"],
-    "tree-sitter-mozjs": ["*.js", "*.js2", "*.jsm"],
+    "tree-sitter-mozjs": ["*.js", "*.js2", "*.jsm", "*.mjs", "*.jsx"],
     "tree-sitter-mozcpp": [
         "*.cpp",
         "*.cx",
diff --git a/src/langs.rs b/src/langs.rs
index 9eb4fca82..badc30dfa 100644
--- a/src/langs.rs
+++ b/src/langs.rs
@@ -21,7 +21,7 @@ mk_langs!(
         MozjsCode,
         MozjsParser,
         tree_sitter_mozjs,
-        [js, jsm],
+        [js, jsm, mjs, jsx],
         ["js", "js2"]
     ),
     (
diff --git a/tree-sitter-mozjs/package.json b/tree-sitter-mozjs/package.json
index ef3d956af..ecb43c225 100644
--- a/tree-sitter-mozjs/package.json
+++ b/tree-sitter-mozjs/package.json
@@ -27,7 +27,9 @@
       "file-types": [
         "js",
         "js2",
-        "jsm"
+        "jsm",
+        "mjs",
+        "jsx"
       ]
     }
   ],