diff --git a/src/zen/sessionstore/ZenWindowSync.sys.mjs b/src/zen/sessionstore/ZenWindowSync.sys.mjs
index 46f479b0d..325068840 100644
--- a/src/zen/sessionstore/ZenWindowSync.sys.mjs
+++ b/src/zen/sessionstore/ZenWindowSync.sys.mjs
@@ -798,6 +798,7 @@ class nsZenWindowSync {
           {
             fullScale: true,
             fullViewport: true,
+            backgroundColor: "transparent",
           }
         );