Arnason was then penalised for bringing down St Ledger in the area, but Johnson missed from the spot.
But the hosts almost conceded a second with 20 minutes remaining when Arnason headed wide from Alan Gow's corner.
Social Democrat leader Arni Pall Arnason, while disappointed, refused to acknowledge that the two centre-right parties had been given a major vote of confidence.
Influential Iceland midfielder Kari Arnason returned from injury for Aberdeen, replacing Chris Clark, while Ryan Jack was preferred to Rory McArdle in defence.
The hosts should have levelled when Kari Arnason fouled Sean St Ledger in the box, but Adam Johnson drilled the resulting penalty wide.
In his own small way an icelandic former carpenter named Asgeir Arnason has contributed to a startling turn in the medical assault on heart disease.
The visitor's finally made the breakthrough when Healy picked himself up after being brought by Kari Arnason to dispatch his penalty into the corner of the net.
But they pulled a goal back after 37 minutes when Cammy Bell flapped at Arnason's looping cross and Considine showed great composure to steer the ball into the unguarded net.
But for the longer term a purpose-built plant is on the cards and if Mr Arnason has his way Iceland's buses, and even its private cars, will end up running on fuel cells.
The change gave the hosts fresh impetus and they drew level after 54 minutes when Kilmarnock failed to deal with Kari Arnason's long throw into the box and Mawene nodded the ball home.
Arnason's long throw into the box was flicked on by Fallon to Vernon, who chested the ball down before half-volleying into the top corner past helpless goalkeeper Craig Samson for his sixth goal of the season.
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