Would you like to split your window up into two, three or four different Web sites? Viewing multiple Web sites at once is something Opera does – why not Firefox? Well now with a little help from an extension you can get this functionality as well.
One of my favorite features in Opera is having the ability to cascade or tile your tabs, which is something that many browsers don’t support. That’s because Opera is built using a Multiple Document Interface (MDI) that allows for these operations to take place. Having this feature always allowed me to view to different websites side-by-side which I find to be extremely useful.