diff --git a/platform/webext/install.rdf b/platform/webext/install.rdf
index f4f3be3f0..cc8a8b258 100644
--- a/platform/webext/install.rdf
+++ b/platform/webext/install.rdf
@@ -21,7 +21,7 @@
{{ec8030f7-c20a-464f-9b0e-13a3a9e97384}}
54.0
- 57.0a1
+ 56.*
@@ -30,7 +30,7 @@
{{aa3c5121-dab2-40e2-81ca-7ea25febc110}}
54.0
- 57.0a1
+ 56.*