I wrote this up and
added it.
Code:
## Websites known not to work
If If there is a `no-cache` entry in the cache-control, caching is disabled for that website. This can be checked in the HTTP headers, either through the Inspect Element > Network tool in the browser in Firefox or Chromium-based browsers or by using a third-party tool such as [this one provided by DNSChecker](https://dnschecker.org/server-headers-check.php).
Here are websites known to not work with the browser cache:
- archiveofourown.org
- ficbook.net (as of March 2023)
I also added a link to the first paragraph, but didn't remove the ficbook comment from that.