diff --git a/lib/make/webgl.js b/lib/make/webgl.js
index c1a557d..b3dc18f 100644
--- a/lib/make/webgl.js
+++ b/lib/make/webgl.js
@@ -786,8 +786,8 @@ class webgl extends make {
     return random.item(pname)
   }
 
-  static randomExtension () {
-    let extension = [
+  static randomExtension (pattern) {
+    let extensions = [
       'ANGLE_instanced_arrays',
       'EXT_blend_minmax',
       'EXT_color_buffer_half_float',
@@ -813,7 +813,13 @@ class webgl extends make {
       'WEBGL_lose_context'
     ]
 
-    return random.item(extension)
+    if (pattern) {
+      let candidates = []
+      extensions.forEach((ext) => ext.includes(pattern) ? candidates.push(ext) : '')
+      return random.item(candidates)
+    }
+
+    return random.item(extensions)
   }
 }