Figure 1: ebay.com with noscript mask
Figure 2: ebay.com with noscript mask removed by greasemonkey user script
Since I wrote this script, I have noticed that NoScript has a checkbox "Hide <NOSCRIPT> elements" under Options -> Advanced -> Untrusted that lets you do what this script does. As such, this script is unnecessary. However, in the unlikely situation that you want to target ebay specifically instead of globally targeting all sites, you can still use this script.
The source code is in the public domain.