Download local files off of a website using Selenium

Question

I need to inspect the contents of this file (or download it and somehow search that way) named "(index)" (it doesn't have any extension if that matters) on my target website (reddit.com) to search through and find an access token to then use later in my script.

How would I go about doing this? Also, this seems like a roundabout way of doing it, so do you have any suggestions that would be better? For example, is there a command I can execute in the console with driver.execute_script("something") to then search the file for me?

I have tried driver.page_source, but, as expected it doesn't return anything involving the pages files.