I was looking for a feature similar to Scrapbook, which was available in an earlier version of Firefox Add-on, and I am generally satisfied with SingleFile.

However, there are some areas where it falls short on pages with images.
Many pages display images in a reduced size, and when you click on them, they enlarge, but it is a bit disappointing that you cannot capture the enlarged image.

In many cases, the enlarged images are displayed in a reduced size even if they are stored in a different directory within the same domain.
If this issue were addressed, I would be very satisfied.