diff --git a/assets/src/bundles/webapp/readme-rendering.js b/assets/src/bundles/webapp/readme-rendering.js
--- a/assets/src/bundles/webapp/readme-rendering.js
+++ b/assets/src/bundles/webapp/readme-rendering.js
@@ -52,6 +52,15 @@
       tables: true,
       extensions: [showdownHighlight]
     });
+    const browsedObjectMetadata = swh.webapp.getBrowsedSwhObjectMetadata();
+    if (browsedObjectMetadata.hasOwnProperty('origin_url')) {
+      try {
+        const originUrl = new URL(browsedObjectMetadata.origin_url);
+        if (originUrl.hostname === 'github.com') {
+          converter.setFlavor('github');
+        }
+      } catch (TypeError) {}
+    }
 
     try {
       const response = await fetch(markdownDocUrl);