I cant' find any information thru USPS.com. THe autofill is not listed as part of the ecommerce API - whether it was before or not I don't know. If it was then they have removed it.

The new click and ship is now more than one page - first choose country, then log in, then -- because of the changes, I had to choose the answer to a security question. And then I go to the input screen. That page is the same url as the mod. But I don't remember having to login before.

The javascript that was being used in the mod no longer exists.

The mod was dependent on no log in required so if it is possible to redo this mod, it will have to be totally different - and may not be possible to do.