diff --git a/sandwich-webdriver/src/Test/Sandwich/WebDriver/Internal/Capabilities/Extra.hs b/sandwich-webdriver/src/Test/Sandwich/WebDriver/Internal/Capabilities/Extra.hs
index 086c6234..37259549 100644
--- a/sandwich-webdriver/src/Test/Sandwich/WebDriver/Internal/Capabilities/Extra.hs
+++ b/sandwich-webdriver/src/Test/Sandwich/WebDriver/Internal/Capabilities/Extra.hs
@@ -101,11 +101,21 @@ configureDownloadCapabilities downloadDir caps@(W.Capabilities {W.browser=browse
     Nothing -> return ()
     Just _ -> liftIO $ throwIO $ userError [i|Can't support Firefox profile yet.|]
 
+  let saveToDiskMimeTypes = [
+        "application/gzip"
+        , "application/x-gzip"
+        , "application/x-gtar"
+        , "application/x-tgz"
+
+        , "application/pdf"
+        , "application/zip"
+        ]
+
   profile <- liftIO $ FF.defaultProfile
     & FF.addPref "browser.download.folderList" (2 :: Int)
     & FF.addPref "browser.download.manager.showWhenStarting" False
     & FF.addPref "browser.download.dir" downloadDir
-    & FF.addPref "browser.helperApps.neverAsk.saveToDisk" ("*" :: String)
+    & FF.addPref "browser.helperApps.neverAsk.saveToDisk" (T.unpack (T.intercalate "," saveToDiskMimeTypes))
     & FF.prepareProfile
 
   return (caps { W.browser = browser { W.ffProfile = Just profile } })