They are also ads that like to track you. I don't see them myself, but I do see this in the console:

The resource at “https://www.googletagservices.com/tag/js/gpt.js” was blocked because tracking protection is enabled.

The resource at “https://www.google-analytics.com/analytics.js” was blocked because tracking protection is enabled.

The resource at “https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js” was blocked because tracking protection is enabled.

I also noticed that Steemit doesn't set cookies in Firefox, but does on some versions of Chrome, without a warning, which is against the law in some jurisdictions; 6 cookies and some local storage, to be exact.

When I remove these cookies, Steemit logs me out; when I block Steemit from setting cookies, I can't login, because:

app.c0f8216….js:1 Uncaught SecurityError: Failed to read the 'localStorage' property from 'Window': Access is denied for this document.

Such fun.