Getting to the bottom and saving a webpage which has "Infinite scrolling"

There is a Tumblr blog which is just one long page with thousands of entries. Once I reach what appears to be the bottom of the page, more text/posts loads.

How I get to the bottom of the page without scrolling/pressing page down? Is there some way of doing this? I don't mind using Firefox, Chrome or Edge.

My aim is to save the page on my HD, so that I can read it from chronological order (unfortunately, the archive feature of Tumblr doesn't work on this blog).

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