Using this addon, Iranian users can change the default page shown when visiting forbidden pages with their homepage or any other webpage they prefer.
You can set your favorite news site, online game, or even simply a weather page, and get updated with the latest information once in a while.
This addon currently has two limitations:
1. Some websites don't allow being showing inside an iframe, and so cannot be used as replacement (they just show up as empty pages), for example google.com
2. You can't use another forbidden page as a replacement. Duh!