diff --git a/toolkit/components/resistfingerprinting/RFPHelper.sys.mjs b/toolkit/components/resistfingerprinting/RFPHelper.sys.mjs
index 31eacc47dbe47b32f1125409c63fd58e461d7433..2f5756716e2661aa13b857e9e36c0c346f9d4ace 100644
--- a/toolkit/components/resistfingerprinting/RFPHelper.sys.mjs
+++ b/toolkit/components/resistfingerprinting/RFPHelper.sys.mjs
@@ -382,7 +382,9 @@ class _RFPHelper {
       // ... privileged pages
       contentPrincipal.isSystemPrincipal ||
       // ... about: URIs EXCEPT about:blank
-      (currentURI.schemeIs("about") && currentURI.filePath !== "blank")
+      (currentURI.schemeIs("about") && currentURI.filePath !== "blank") ||
+      // ... browser extensions
+      contentPrincipal.addonPolicy
     );
   }