diff --git a/extensions/firefox/README.mozilla b/extensions/firefox/README.mozilla
index a83cef425..a7be57a63 100644
--- a/extensions/firefox/README.mozilla
+++ b/extensions/firefox/README.mozilla
@@ -1,3 +1,4 @@
 This is the pdf.js project output, https://github.com/mozilla/pdf.js
 
 Current extension version is: PDFJSSCRIPT_VERSION
+