I noticed a new feature that I've never run across before, which I had been wanting years ago and had totally forgotten I'd ever wished for. I didn't notice when it was implemented.
In some cases, when you click on a footnote reference mark, and there's a title of a book in that footnote,

and you click on that title, and that book happens to be one that Logos has, you'll see a "resource" link on the reference popup.

If you click on that link, it will open the book in Logos for you (assuming you have it).

Yay!
Here is a thread that asked for this feature, though I am pretty sure I remember this being asked for multiple times before:
https://community.logos.com/forums/t/168686.aspx