And here's page functionality in JS: pastebin.com/J0rHXEVi

This could easily be made into a browser extension, but for now, do the following to get it working:

1. Append ?page=[n] to the end of a thread URL, where [n] is the page number starting at 1.
2. Reload the page to apply this change.
3. Open the developer tools by pressing F12.
4. Navigate to the "Console" tab.
5. Paste the provided code (see Pastebin link) into the console and press Enter.