Motherwell responded by heading straight upfield where John Sutton had a header from Keith Lasley's pass turned away by goalkeeper Mark Howard.
Murphy and Jennings were both denied in a frantic goalmouth scramble after Shpetim Mocka fumbled Forbes' free-kick and the goalkeeper parried John Sutton's header from a Slane corner and Murphy forced home.
Black sent a 20-yard drive inches over the crossbar before Webster rose to meet a long throw, John Sutton played it back into his path and the central defender fired low past Stack.
Cillian Sheridan doubled the lead in the second-half with a tap-in and John Sutton's close-range strike completed the rout four minutes from time.
John Sutton's glancing header wide from a McLean cross offered an immediate response, before David Clarkson drove straight at Janos Balogh from distance.
After a goalless first half, the visitors were awarded a penalty just after the break when John Sutton was fouled by Bledion Guga.
Goals by Steven Saunders and John Sutton gave Well their win in Edinburgh and ended a run of four straight defeats.
Jim O'Brien's first goal for 'Well, a deflected drive, handed them a deserved half-time lead but misfiring striker John Sutton should have made it more.
Though he failed to firmly convince fans of either of those clubs of his ability, he has been pinpointed as a pivotal player for OB and, as such, John Sutton will be asked to play off the front to 'sit' on Djemba-Djemba, to try to lessen his influence.
Boyd powered home a superb long-range drive eight minutes later, but John Sutton matched that before the break.
'Well sent on John Sutton in place of Esteban Casagolda and the striker's first contribution was to head a long ball on for Forbes, whose volley hit the bar on its way out.
Jim Gannon made a double switch at half-time with Keith Lasley and Jim O'Brien coming on for John Sutton and Forbes, and Jamie Murphy moving to play through the centre.
John Sutton passed up several chances on either side of the interval to restore parity and Michael Fraser kept out a Jack Compton strike for Falkirk.
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