diff --git a/extension/manifest.json b/extension/manifest.json
index fdcfaf0d2d9c978bcbd55f4c82c2b3f933bb3751..208029ae1f767c6eeb3f26cb773d02b001164332 100644
--- a/extension/manifest.json
+++ b/extension/manifest.json
@@ -15,8 +15,7 @@
     "applications": {
         "gecko": {
             "id": "safelinks-cleaner-thunderbird@it.liu.se",
-            "strict_min_version": "78.4",
-	    "strict_max_version": "78.*"
+            "strict_min_version": "78.4.0"
         }
     },
     "background": {