diff --git a/gallery_dl/extractor/newgrounds.py b/gallery_dl/extractor/newgrounds.py
index dfa1f6ef..b60e2256 100644
--- a/gallery_dl/extractor/newgrounds.py
+++ b/gallery_dl/extractor/newgrounds.py
@@ -32,6 +32,8 @@ class NewgroundsExtractor(Extractor):
         self.user_root = "https://{}.newgrounds.com".format(self.user)
 
     def _init(self):
+        self._extract_comment_urls = re.compile(
+            r'(?:<img |data-smartload-)src="([^"]+)').findall
         self.flash = self.config("flash", True)
 
         fmt = self.config("format")
@@ -78,8 +80,7 @@ class NewgroundsExtractor(Extractor):
                         if "_fallback" in post:
                             del post["_fallback"]
 
-                for url in text.extract_iter(
-                        post["_comment"], 'data-smartload-src="', '"'):
+                for url in self._extract_comment_urls(post["_comment"]):
                     post["num"] += 1
                     post["_index"] = "{}_{:>02}".format(
                         post["index"], post["num"])
diff --git a/test/results/newgrounds.py b/test/results/newgrounds.py
index 3bf15eae..8bdfd37e 100644
--- a/test/results/newgrounds.py
+++ b/test/results/newgrounds.py
@@ -94,6 +94,20 @@ __tests__ = (
     ),
 },
 
+{
+    "#url"     : "https://www.newgrounds.com/art/view/sockdotclip/trickin-treats",
+    "#comment" : "extra files in comment section as '<img src=' (#6253)",
+    "#class"   : newgrounds.NewgroundsImageExtractor,
+    "#urls"    : (
+        "https://art.ngfiles.com/images/2811000/2811344_sockdotclip_trickin-treats.png?f1667246310",
+        "https://art.ngfiles.com/comments/788000/iu_788899_10504416.webp",
+        "https://art.ngfiles.com/comments/788000/iu_788901_10504416.webp",
+        "https://art.ngfiles.com/comments/788000/iu_788900_10504416.webp",
+        "https://art.ngfiles.com/comments/788000/iu_788903_10504416.webp",
+        "https://art.ngfiles.com/comments/788000/iu_788902_10504416.webp",
+    ),
+},
+
 {
     "#url"     : "https://www.newgrounds.com/art/view/kekiiro/red",
     "#comment" : "'adult' rated (#2456)",