looking to commission a firefox extension

I have no idea where else to post this but I'm willing to pay for a firefox extension to be developed. Programming is not one of my skillsets.

I want an XPI to do the following:

Replace Save Asis behavior so it preserves the server timestamp for specific domains

Failing that,
Add a command to the context menu (with the ability for the user to name it) for wget to save the image to a specified directory.