Not sure if this is the place to post for further plugin enhancements as I know you didn't develop it but can't find anywhere else to post!
It would be good if you could maintain a list of sites and the corresponding validation setup so that the firefox validator could recognise the url decide if it should be validating (as when I am browsing other sites i don't want it on) and also load the appropriate validator settings e.g
Site setting
www.myURL.co.uk XHTML, single A
www.myURL2.co.uk XHTML, double A
Thanks
Tim



