Dunfermline are now 11 points clear in second after battling past Forfar 4-2 at Station Park.
Jim Jefferies' side took the lead after four minutes when Moroccan defender Faissal El Bakhtaoui fired into the far top corner.
Forfar, however, drew level with half-time approaching thanks to James Dale, the English midfielder finding the bottom corner for his first goal since last September.
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Dick Campbell's men then pulled ahead on the hour when Gavin Swankie powered a shot past a helpless Ryan Scully.
El Bakhtaoui went from taker to maker, squaring for substitute Stephen Husband to equalise before a Darren Dods own goal made it 3-2 for the visitors in a whirlwind five minutes.
Lawrence Shankland came off the bench to put a flattering gloss on the scoreline at the end, firing in Danny Grainger's cross.
At the other end, Airdrie climbed off the foot of the table with a 2-1 win at home to Brechin.
Arbroath replaced Airdrie as League One's basement club after drawing 1-1 at Stranraer, who are now third above Ayr on goal difference.
East Fife, without a win in three games under Gary Naysmith, stay third bottom after drawing 1-1 at Stenhousemuir.