Need to test your web pages out in Google Chrome, Internet Explorer, Safari, Opera (or anything else for that matter)?
Open With adds options to the view menu, context menu, or tab menu for opening the current page in another browser.
Open With is a SeaMonkey extension that adds items to your View menu, your tab bar menu, or your context menu, which will open the page you're looking at in another browser.
On Windows it looks up the browsers you have installed using the Windows registry. Other browsers can be added manually. Automatic lookup on OS X and Linux is planned for a later version.