diff --git a/firefox/docker-compose.yaml b/firefox/docker-compose.yaml
index 218ac89..dd0bcf4 100644
--- a/firefox/docker-compose.yaml
+++ b/firefox/docker-compose.yaml
@@ -13,6 +13,8 @@ services:
       MYVNC_VNCPASS: ${MYVNC_FIREFOX_VNCPASS}
 
       MYVNC_CUSTOM_TITLE: ${MYVNC_FIREFOX_CUSTOM_TITLE}
+
+      MYVNC_DOMAIN: ${MYVNC_DOMAIN}
       MYVNC_PROXYPATH: ${MYVNC_FIREFOX_PROXYPATH}
 
       MYVNC_FIREFOX_URL: ${MYVNC_FIREFOX_URL}