I created a shop with articles whose urls contain accents.
When I added to the basket and I clicked continue purchases, eZ return "module not found" because URLs are reformatted.
At the line 191 to the basket.php file in "/kernel/shop/", I've add the urldecode function :

$module->redirectTo( urldecode($fromURL) );

The bug was introduced with the latest update FF3

Steps to reproduce

Create a shop.
Create articles whose urls contain accents.
Add to the basket.
Click on the "ContinueShoppingButton".
Look the error.