Before Firefox 57 I used the extension that could save web pages as MAFF or MHTML. I thought all was lost when I updgraded to FF57. Then I found this extension. I like it even better than the old extension.

It saves complete pages as HTML and includes all of the graphics within the HTML. Any modern browser can open the pages without a problem. They look exactly the same as the original.

If you want to save web pages in a format that can be opened by any modern browser, this is the extension for you.