Make Opera Compatable with any site

Sometimes, sites say that your Opera is not compatible. This means that you cannot use Opera to access that site. However, Opera offers a nifty way to get around this, for most sites support Opera 12 and up, even if they don't know it. And, with many Google services, you will see something like this:

So you right click on the site and it will display a menu. The second option from the bottom should be "edit site preferences". Click this and you should see something like this: 

Click on "Network" and something like this should come up:

Click on the drop down menu where it says "identify as Opera and select Mask as Firefox. When you are finished you will see this: 

Click "OK" and refresh the page. Do this to any page that says it is not compatible with Opera.