Split Google Chrome Window or Tab and Firefox Windows or Tabs into 2 in the middle so as to open 2 websites in each pane side-by-side, using a javascript plugin developed by Chromeplugins.This plugin will enable you to browse 2 websites in the side by side “panes” in Chrome and firefox in the same tab.

Here’s how you can do it in FireFox and Chrome

1. Create a bookmark with this code as link
   

   javascript:A14nH=location.href;L3f7=prompt(‘Choose%20File%201′,A14nH);R1Gh7=prompt(‘Choose%20File%202′,L3f7);if(L3f7&&R1Gh7){Fr4Q=’<frameset%20cols=\’*,*\’>\n<frame%20src=\”+L3f7+’\'/>’;Fr4Q+=’<frame%20src=\”+R1Gh7+’\'/>\n’;Fr4Q+=’</frameset>’;with(document){write(Fr4Q);void(close())}}else{void(null)}

   and Name as Dual View

   To Create a bookmark, Right click on the Bookmark Tool and select New Bookmark [ In FireFox ] and Add Page [In Chrome ]

2. Click Dual View on your bookmarks bar. A pop-up box will appear, like thisthen the next
   
3. Don’t forget the http:// or it will not work
4. Now you get the resulted split window

What Could be the use of splitting the Windows ??

• Comparing Text, Search results,images..etc
• Writing Blog posts, with reference to webpages.
• Easy browsing for sites.

Source : HackingTuts