Note that we only use Amazon as an example: the simple trick explained in this tutorial will work to fix most every website problem you're likely to encounter in Opera.
Here are the simple steps to follow to make problematic websites work in Opera:
You are done! Press F5 or hit Ctrl+R (Windows or Linux) or Command+R (Mac OS X) to reload the web page. Your problem should now be fixed; in our example, we are now able to use the Amazon Online Reader without any issue!