diff --git a/src/core/cff_parser.js b/src/core/cff_parser.js
index 44e0b481e50ed..d61a7f514bca5 100644
--- a/src/core/cff_parser.js
+++ b/src/core/cff_parser.js
@@ -792,6 +792,12 @@ class CFFParser {
     );
     parentDict.privateDict = privateDict;
 
+    if (privateDict.getByName("ExpansionFactor") === 0) {
+      // Firefox doesn't render correctly such a font on Windows (see issue
+      // 15289), hence we just reset it to its default value.
+      privateDict.setByName("ExpansionFactor", 0.06);
+    }
+
     // Parse the Subrs index also since it's relative to the private dict.
     if (!privateDict.getByName("Subrs")) {
       return;