Works on news media sites too! Rated 5 out of 5 stars
Not only does the add-on work with the sites the developer listed, but by checkmarking the "Thumbnails" field in the setup options, it will enlarge images on news media sites such as BBCNews which aren't even thumbnails to begin with. It even adds the image description to the enlarged version even if that's not actually visible in the original. In fact, I've yet to find a site where it doesn't work.
This is truly an excellent add-on which is well worth adding to your repertoire.