diff --git a/toolkit/jetpack/sdk/panel.js b/toolkit/jetpack/sdk/panel.js
index 4b625799d7..34cde2eddd 100644
--- a/toolkit/jetpack/sdk/panel.js
+++ b/toolkit/jetpack/sdk/panel.js
@@ -8,6 +8,7 @@
 module.metadata = {
   "stability": "stable",
   "engines": {
+    "Palemoon": "*",
     "Firefox": "*",
     "SeaMonkey": "*"
   }