The Auto-save all tabs feature was extremely helpful when I wished to use this as part of an automated solution to read the HTML of a site that was blocking all my standard Linux programs. (So I now run Firefox with the URL in question and then this extension automatically grabs its source code.)

To run Firefox with a URL just type firefox https://example.com. You can set it up to work with a VNC program if you don't want it to display on the screen.