Split Browser
The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
Publisher's Description
From Shimoda Hiroshi:
Split Browser is an extension that will split the content area of a tab as you desire. It will help you in various cases. For example, to compare multiple Web pages, to show a calendar always, and so on. You can split browsers over and over. Status of split browsers are saved, and automatically restored on the next startup.
