The desired page is linked by action=raw. Usually the result shouldn’t be displayed in your browser, but suggested to be saved. Automatically index.php should have been used as file name then.
That might be different if a browser has been configured for text/x-wiki or PHP source code handling. However, who is able to do so will know what to do.
The file index.php is to be renamed into .uue (might trigger tool selection).
It is to be decoded with any of various uuencoding tools for free; e.g. WinZip will unpack automatically.
An extracted file .xpi (or a similar name with version information) will show up.
