This is not strictly related to Rust - however, I've had this come up frequently when reading RFC threads.
When a Github issue/PR thread gets over a certain length, Github will hide some of the comments on page load. To see all comments, it's necessary to repeatedly click on a "Show hidden" button, waiting after each click for a new set of comments to load.
This can be extremely frustrating when reading an RFC PR, as discussions frequently grow to hundreds of comments in length. I've seen the same point be brought up multiple times in a single thread, since searching for the previous occurrence would require clicking on "Show hidden" multiple times.
I've created a simple GreaseMonkey script which automatically loads all hidden comments on page load. I find that this makes long discussions much easier to read and search through. Hopefully, other people find this useful as well:
If you have any ideas for how to improve this, please let me know!