From the 15th January you can no longer take a "large" cabin bag for free. So while W6 are relaxing this and allowing a large cabin bag from being the old stingy small handbag only, FR are following W6's old policy and you will need to pay for priority boarding to take the larger standard cabin bag on the aircraft.

So W6 since October: small handbag now extra, but large cabin bag for free.
FR from January: large cabin bag for extra, small handbag for free (no change)

Amazingly, the policy applies to bookings made before the announcement date (surprised thats even legal...) I think, back in October around the same time W6 improved their policy.