diff --git a/collects/net/sendurl.ss b/collects/net/sendurl.ss
index 39dbc60386..0c9d0be2cd 100644
--- a/collects/net/sendurl.ss
+++ b/collects/net/sendurl.ss
@@ -57,8 +57,7 @@
       [(procedure? external) (external url-str)]
       [(eq? stype 'macosx)
        (browser-process
-        (format "osascript -e 'open location \"~a\"'"
-                url-str))]
+        (format "open \"~a\"'" url-str))]
       [(eq? stype 'windows)
        (shell-execute #f url-str "" (current-directory) 'SW_SHOWNORMAL)]
       [(not (eq? stype 'unix))
@@ -77,7 +76,8 @@
        => (lambda (exe)
             (browser-process* exe (if separate-window? "-w" "-x") url-str))]
       [(or (use-browser 'netscape)
-           (use-browser 'mozilla))
+           (use-browser 'mozilla)
+           (use-browser 'firefox))
        => (lambda (exe)
             ;; netscape's -remote returns with an error code, if no netscape is
             ;; around.  start a new netscape in that case.