Or just turn it off, you raving, hysterical lunatic.
Or just click the cog and choose 'classic' to have tiles without participating in the 'enhanced' version they're talking about (or 'blank' for nothing)!
Also on the top right of a new tab is a settings 'cog' where you can choose "Enhanced", "Classic" or "Blank" so you can easily turn this off.
The details are fairly straightforward and are laid out on this page.
Some choice exerpts to soothe the paniced minds:
Easy to control
Tiles are easily pinned, moved around or removed using simple drag-and-drop and close interfaces. If you do not want to see any Tiles, you can deactivate them completely in two clicks through the new tab gear control.
Respects your privacyWhat data is being collected?
Mozilla collects Tiles related data such as number of clicks, impressions and Tile specific data (e.g. position and size of grid) to help Mozilla determine how frequently the Tile has been seen or interacted with, as well as your IP address (collected by Firefox, quickly translated into a region code and then deleted).
What data is collected when I opt out?No data is collected when a user deactivates the Enhanced Tiles experience.
Unlike the desktop version of Firefox, though, mobile Firefox downloads the ads and merely hides them, meaning that on a platform where you really don't want to waste unnecessary data, FF mobile's adblock is merely an exercise in aesthetics.
"Been through Hell? Whaddya bring back for me?" -- A. Brilliant