This extension works fine- does all that it says it does. Unfortunately, there is no host-site listed and the source code is nowhere to be found. It is mandatory that any time a program licensed under the GPL is released that the source code is also made available.

Thus, this extension is in violation of the GPL and should be avoided. You have no idea what this extension does if you cannot see the code!

EDIT: There is now a source code listing on this page. Updating rating to 4 stars- Need to check it myself and make sure it functions the same.