You might be able to do this with the Greasemonkey or Scriptish extension and a userscript. When a page or userscript launches a new window using the window.open() method, it can specify a name for that window (e.g, "my_search"). If you keep that named window open next to your main window, every time you load a new page in the first window your script can load the new URL in the second window by re-using that window name. I need to add "in theory" because I haven't tested this idea. To get assistance with writing a userscript, you can try this forum: [http://userscripts.org/forums/2 Ideas and script requests - Userscripts.org].