Certainly don’t want a pop-up. But the way the layout is designed can help communicate such things. On that same page is a Firefox logo. I really wouldn’t read the Firefox logo as something that is dynamically loaded. So what sets that apart from the sponsored links?
Well, not that easy to pro-actively communicate such things. Randomly throwing a popup at users would be pretty annoying, too.
They do communicate the details here: https://support.mozilla.org/kb/sponsor-privacy
Certainly don’t want a pop-up. But the way the layout is designed can help communicate such things. On that same page is a Firefox logo. I really wouldn’t read the Firefox logo as something that is dynamically loaded. So what sets that apart from the sponsored links?