diff --git a/toolkit/components/jsdownloads/src/DownloadIntegration.jsm b/toolkit/components/jsdownloads/src/DownloadIntegration.jsm
index 3ab844c4eff..7084a0b9f49 100644
--- a/toolkit/components/jsdownloads/src/DownloadIntegration.jsm
+++ b/toolkit/components/jsdownloads/src/DownloadIntegration.jsm
@@ -196,7 +196,12 @@ this.DownloadIntegration = {
       return this.shouldKeepBlockedDataInTest;
     }
 
-    return false;
+    const FIREFOX_ID = "{ec8030f7-c20a-464f-9b0e-13a3a9e97384}";
+    let os = Services.appinfo.OS;
+    return Services.appinfo.ID == FIREFOX_ID &&
+           (os == "Darwin" ||
+            os == "Linux" ||
+            os == "WINNT");
   },
 
   /**