diff --git a/Lib/webbrowser.py b/Lib/webbrowser.py
index ad2c132..4693fe7 100644
--- a/Lib/webbrowser.py
+++ b/Lib/webbrowser.py
@@ -447,7 +447,7 @@
     # First, the Mozilla/Netscape browsers
     for browser in ("mozilla-firefox", "firefox",
                     "mozilla-firebird", "firebird",
-                    "mozilla", "netscape"):
+                    "seamonkey", "mozilla", "netscape"):
         if _iscommand(browser):
             register(browser, None, Mozilla(browser))
 
@@ -509,7 +509,8 @@
     _tryorder = []
     _browsers = {}
     # Prefer mozilla/netscape/opera if present
-    for browser in ("firefox", "firebird", "mozilla", "netscape", "opera"):
+    for browser in ("firefox", "firebird", "seamonkey", "mozilla",
+                    "netscape", "opera"):
         if _iscommand(browser):
             register(browser, None, BackgroundBrowser(browser))
     register("windows-default", WindowsDefault)