432063 - browser window should have split-window function, to view two parts of the same page at the same time

Status: RESOLVED DUPLICATE of bug 231156

(Firefox :: General, enhancement)

Description

[Rich Ellis]

User-Agent:       Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13
Build Identifier: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.8.1.13) Gecko/20080311 Firefox/2.0.0.13

Every browser window/tab should have a "split window" function similar to that found in PDF readers or word processing tools.  The idea is to have a quick way to split the current page into two panes in the same window, so that two different parts of the page can be viewed at once.  For instance, sometimes a page might contain a long table of facts (like a product comparison chart) with a header row and then lots of data rows.  It would be nice to be able to split the window so that the header row always stays visible, but the rest of the page can be scrolled down.

Note that this would be two views of the same page, so that an action in one (clicking a button or link) would have the effect in both views.  It would probably be safest to remove the split when a URL is clicked that navigates to a new page.

UI recommendation:  small draggable widget at the top of the vertical scrollbar.  So if I want a split window, I just click and drag it down and the window splits, then I can adjust the percentage of the split by dragging that widget.  (See Adobe Acrobat's or Microsoft Word's implementation).

Reproducible: Always

Steps to Reproduce:
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