A promising extension. However I was looking for a way to download multiple links, such as what DownThemAll could do.
Croâ's review, about 4 months before this one, gives a way to just copy the URLs of the selected links: hold down the CTRL key before releasing the right mouse button.
With the copied URLs I can then download them using a command such as wget or curl.
For my particular web site of interest, Snap Links Plus allows me to interactively choose what links to download and then with a simple workaround I can download them.