Utterly nonfunctional for my purposes. Needed to preserve a particular web page exactly as it currently displays for legal reasons, because I'm about to initiate a legal action for which material on the page is important evidence. As soon as the action begins, the sod operating the page will change it to hide the evidence, so I need to save it the way it is--and save it completely independently of the web. Everything has to be on my hard drive. Firefox's save complete web page is not working with this site, and the web page is too long, so Firefox's screenshot feature doesn't capture the end of the page--which is where my most important evidence is. So I hoped this add-on would take care of the problem. Unfortunately it doesn't. The right-click options are all greyed out, and when I use the Alt-A shortcut, WE saves only html, not resources. Open up the page source, and all the links point back to the original site.
So: didn't work for me at all. Complete failure.