Your page isn't loading for me know, so I can't test. When I try to load it, I get "This webpage is not available".
As for the issue, the only time the "redirect_uri mismatch" error appears is when your redirection URLs you've configured don't match what JFBConnect is sending.
When I tested yesterday, the "More information" link on the error page from Google showed the URLs with & and not &. In HTML, those symbols are equivalent though, so it shouldn't matter.
The only things I can suggest right now are:
* Double-check that you've entered the URLs into Google correctly with no mis-spellings and no spaces at the end of each URL
* Feel free to add each version of URL using & and & in between the parameters. It can't hurt to have more URLs as options
* You can even copy the URL that Google says doesn't match directly into their console, since that's what they are saying they expect.
If that doesn't work, let me know when the site is back online and we'll gladly investigate further.
Thanks,
Alex