I have long lobbied for an archive.today link bot for all of the popular spam-adjacent domains (bloomberg, medium, substack, etc)

https://archive.ph/hInjm

p.s. I think it is one of goals of Firefox to dismiss cookie banners[1] so you may want to file a bugzilla about that behavior

1: https://support.mozilla.org/en-US/kb/cookie-banner-reduction...

Does the reader mode not take care of all the unnecessary formatting, including the banner?

It's just providing the most valuable commodity of friction. :)