Replacing the front seat head restraints
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Remove:
Press your thumb just under the frame (holes inside the upholstery) on the rear of the backrest
Pull the head restraint straight up at the same time
Install:
Insert the head restraint in the bushings so that the catches engage