diff --git a/extension/manifest.json b/extension/manifest.json
index 333a7fe..7b885e4 100644
--- a/extension/manifest.json
+++ b/extension/manifest.json
@@ -65,7 +65,7 @@
       "js": ["plugin-api.js","keysocket-eighttracks.js"]
     },
     {
-      "matches": ["https://music.amazon.com/*", "https://music.amazon.de/*"],
+      "matches": ["https://music.amazon.com/*", "https://music.amazon.de/*", "https://music.amazon.co.jp/*"],
       "js": ["plugin-api.js", "keysocket-amazon-cloud-player.js"]
     },
     {