Using Session Storage as a cache? #14399

I was recently debugging some JavaScript on a website and noticed that every tab in my browser had Dark Reader keys in sessionStorage. A code search seems to indicate that Dark Reader uses session storage for caching.

I'm not very familiar with WebExtensions development, but is there somewhere more private that Dark Reader could use as a cache so that sites can't directly detect that someone is using Dark Reader, for whatever reasons they might do that? I use several other extensions, and I haven't seen keys from any of the others in session storage.