OperaView is an Addon/ Extension for Mozilla Firefox and Flock which is very similar (and actually based on) IE View.
Even if you are using Mozilla browser all the time, sometimes you need to view the page you are looking at in Opera browser (especially if you are a web developer). OperaView makes that process easier by adding the item View This Page in Opera to the page context menu, the item Open Link Target in Opera to the link context menu and a button to the toolbar. If you want to open a page in Opera quickly, just right click somewhere on the page and choose new menu item.