I have released a userscript called Expand Everything (https://github.com/ludios/expand-everything) which clicks on all the "show more" links on a page, so that you have a lot more of the page text available for searching, copying, or archiving. It supports these sites right now: https://i.imgur.com/6CwCCvu.jpg

computer programmer, information collector, archivist-librarian with a few items, puzzle game appreciator; github.com/ivan 

This is implemented using MutationObserver and querySelectorAll to watch for certain elements that should be clicked on, but crucially: 1) the MutationObserver is disconnected after e.g. 100 mutations to avoid slowing things down, and

2) the MutationObserver is reinstalled after an SPA navigation (because there might be new elements to click on). This currently relies on the 'navigate' event which is still Chromium-only (https://caniuse.com/mdn-api_navigation), but I am open to contributions to make this work elsewhere.