Think it doesnt matter if you know the site (since it just shows this message):
Forbidden

You don't have permission to access / on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.


<removed website name>


Why would read and executions rights change all of a sudden?

Not sure which files to check, index.php got read and write permissions, not execute.

Dont know much about what permissions they need, if it is execute to show them in browser. And dunno how to change the permissions for all the needed files. If that is the case.