Update cutoff

Author: juj

test/common.py

@@ -2742,8 +2742,10 @@ def run_browser(self, html_file, expected=None, message=None, timeout=None, extr
       print('[browser launch:', html_file, ']')
     assert not (message and expected), 'run_browser expects `expected` or `message`, but not both'
 
+    # Accurate version cutoff is not known.
     # Needed at least for version Safari Version 17.6 (17618.3.11.11.7, 17618)
-    if is_safari() and get_safari_version() < 180000: # TODO: Find accurate version cutoff
+    # Not needed for Safari Version 18.5 (20621.2.5.11.8)
+    if is_safari() and get_safari_version() < 180500:
       # Old Safari cannot handle running multiple browser pages in the same browser instance
       # So restart the browser between each browser test.
       self.browser_restart()