It actually works. It just plain works. It detects when the infinite loading happens, displays the addon's logo letting you know it fixed it, and then you can place the order. It exposes a drop down field or two that may be initially unintuitive for someone to understand what you're supposed to select while starting to place the order, but that's a small price to pay to get that item you really want but Amazon couldn't be bothered to fix their site. Without this addon I feel a bit bad for the sellers, because they may have no idea why nobody is getting the item they listed in the Vine program. This addon exists for both Firefox and Chrome, and I verified it fixed the infinite loading issue in both.

Actual game changer. First thing I tried it out on had a $0 market value too. 10/10

The man, the myth, the non data hoarding legend. Thank you Anys.