If anyone would like to comment on this:

(Firefox 38.0.5)
I was unable to add items to "Add to my Bag" on the Lands' End web site. I was able to reach someone on the phone who told me the problem was the Ghostery extension. But I don't use that extension. She also told me to use a Private Window. I did and it worked, but first I disabled my extensions, which are Ad Block Plus and HTTPS Everywhere.

I noticed in the lower left corner there is a "Javascript void" message.

Shopping cart software seems pretty basic to me. I would have thought a company like Lands' End would have no trouble with it. They have had this problem for something like two weeks, so far as I've noticed, and possibly have lost sales because of it. I know I put off purchases because the web site kept giving me an error message that also said "We're working on it…"