Hi Dlab,

I can not reproduce this issue. Can you try on http://www.ajaxuploader.com/Demo/Start-uploading-manually.aspx with your firefox 22? Does it get the same problem? If the demo works for you, I suggest you download the latest build and try again.

Latest build downlaod url: http://ajaxuploader.com/download/Ajax-Uploader.zip

RE 

Regards,

Ken