This is a known problem with sites that move the scroll bar from the entire page to an interior element of a page. This is common when there is a fixed sidebar and then a second column scrolls. The developers are aware of this problem but I don't think solving it is on a fast track.

There isn't a built-in fix for this, and fixing it manually requires some knowledge of HTML and CSS to "hack" the page. I don't know whether there is any trustworthy add-on to help with the problem.

For printing a PDF, sometimes my old Print Doctor add-on -- which has a feature to allow page breaks -- can unrestrict the scrolling. But I would need to test the specific site to know for sure. If you run out of other ideas, here's a link to it:

https://addons.mozilla.org/firefox/addon/printable-the-print-doctor/

Note that you can try to use the screenshot feature (Screenshot Node) of the built-in developer tools to take a screenshot of a specific node. You need to find the containing node in the Inspector, so you can right-click on the part you want to screenshot and then move up in the DOM until you get this full part.

• https://firefox-source-docs.mozilla.org/devtools-user/taking_screenshots/