Jet2 has a hard mount built into the window frame for the 737. This involves a trip to the hangar to install the new windows. Also fitting all aircraft with power supplies to enable USB charging in flight. The 737NG fleet is pretty much all EFB. The 737 Classic fleet are working towards getting rid of paper as well as the 757 fleet.
EFB provides Perf calc, LIDO charts, journey logs, ops manuals, etc.