Unfortunately the View Pocket List menu entry in Bookmarks menu cannot easily be removed. (It is there even with browser.pocket.enabled set to false). Fortunately for me that I don't access the Bookmarks menu too often to be annoyed by it.
> Unfortunately the View Pocket List menu entry in Bookmarks menu cannot easily be removed.
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".
