Hadn't seen this before, just as in opera,but more
https://addons.mozilla.org/firefox/4287/previews/


Split Browser

by SHIMODA Hiroshi









More previews…
This splits the content area of the browser window as you like. It will help you in various cases. For example, to compare multiple webpages, to show a calendar always, and so on.

There is some ways to split window.

* Choose the "Split Browser to" menu in the context menu.
* Choose the "Load in Split Browser" menu in the context menu on link.
* Click popup-button on top/bottom/left/right edges of the content area.
* Drop links, bookmarks, etc. to popup-button on top/bottom/left/right edges of the content area while dragging.

You can split browsers over and over. Status of split browsers are saved, and automatically restored on the next startup.
Works with:
Firefox 1.5 - 2.0.0.* ALL Install now (28 KB)


fixPlatformLinks("4287", "Split Browser"); Version 0.3.2007012303, released on Jan 22, 2007.