I thought you were referring to the snippets.
I actually don't see the pocket recommendations on my desktop (maybe the Linux Mint build has them disabled by default), but they are there on mobile. There is a UI setting to disable them of course. It's explained right on the page that you link to.
More importantly, that page also explains that no data gets sent to Mozilla or pocket or anyone else for these ads to show up.
So again, no privacy violation here. I also think it's an extreme leap from "they show this in the new tab page which they design and control" to "they could start showing it overlayed on other peoples content".
I think they got some decisions very wrong. Among them not implementing a way to allow people to override signing of addons, which people did warn about. Having signatures enforced as a strong default is certainly good and right, but if they had included a "right click on addon, use without signature (WARNING THIS IS SKETCHY REAL ADDONS DON'T ASK YOU TO DO THIS)" option this signing issue would have been relatively mild.
But their track record on privacy/security simply isn't as bad as people make it out to be.