Managerless Kilmarnock's winless run extended to 11 games after Brian Graham's second-half close-range finish ended Falkirk's four-game Scottish Premiership goal drought and earned a first win in five.
Kris Doolan, in his first outing in interim charge after the departure of Stuart Kettlewell, failed to turn the negative tide of results for the Ayrshire side, who are 11th in the division, three points clear of bottom spot.
Victory for John McGlynn's side lifted them level on points with Aberdeen in sixth place - albeit having played two more games - as their impressive return to the top flight continued.
Kilmarnock's last win came at the start of October, taking just two points from the last 33 available. The exit of Stuart Kettlewell this week did not arrest that run.
Doolan backed his players as having quality but did point to a bit of bad luck and perhaps more importantly a lack of confidence. That began to show as soon as they conceded.
That said, in a game of few chances as the first half wore on, it was Kilmarnock who began to threaten and impose themselves.
James Brown diverted wide from a great position, Brad Lyons fired off target from distance, then Greg Kiltie nipped in but scooped over.
That promised much for the second period but it never materialsed and Falkirk quickly pounced.
A nice move ended when Kyrell Wilson laid the ball into Graham and, from a few yards out, he had time to control the ball and loft it home.
Kilmarnock were left chasing the game once more. Substitute Marcus Dackers nodding over in injury time was as close as they came.
There was no lack of effort but it was all in vain as they fell to another disappointing outcome in a season of many.
It got worse when home defender Dominic Thompson got involved in an exchange with a home supporter at full-time. Troubling times at Rugby Park.