Is that a surprise in your pocket, or are you just happy to throw away my privacy?
For me the Sync surprise was much more disappointing. They broke the feature to the extent it became unusable for me any more (unless I spend some more weekends trying to understand their poorly-documented proprietary protocol mess, which is not how I'd like to spend time).
It will be removed if you remove the Pocket icon using the (right-click) contextual menu on the icon. The entry is not removed if you remove manually using the `about:config` way.
Related bugzilla entry[1]:
> The normal/supported way to remove Pocket works fine: Right click the button, select "Remove from toolbar".
It makes you wonder what other liberties they'll take to make a couple bucks and when the other shoe will drop. It has made me start actively evaluating alternatives, when previously I considered it to be the best.