Desktop tool support
For help with the desktop tool you should first of all start with the help built into the tool.
If you have an undocumented problem with running the tool then complete the feedback form, ensuring that you enter a valid email address that you can be contacted on.
topExtension support
Once you've installed the Firefox/SeaMonkey extension just right mouse click the 'TV' icon or toolbar button, or select 'Total Validator Options' from the Tools menu to set the options you wish to use.
If you are having problems then check out the information in extension issues documentation to see if this helps. Finally if all else fails then complete the feedback form, ensuring that you enter a valid email address that you can be contacted on.