diff --git a/package.json b/package.json
index 2998f1fcb2ac672716bacc81a9ca54c12f510061..a501d9a1e46089d8e59c7c2e2c926f43c60c3116 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
   "id": "jid1-BoFifL9Vbdl2zQ@jetpack",
   "engines": {
     "firefox": ">=38.0a1",
-    "fennec": ">=38.0a1"
+    "fennec": ">=38.0a1",
+    "seamonkey": ">=2.0"
   }
 }