Combine all the salsa ingredients in a bowl. Stir together and taste, then add additional salt if desired. Store salsa in the fridge until ready to serve.
Select the Preheat function on the Cosori Smart Air Fryer Toaster Oven, adjust temperature to 430°F, and press Start/Pause.
Line the food tray with foil, then place mahi mahi on the tray. Drizzle with olive oil and season with salt and pepper.
Insert food tray at top position in the preheated oven.
Select the Air Fry function, adjust time to 9 minutes, and press Start/Pause.
Remove when the internal temperature of the mahi mahi reaches close to 145°F. Allow fish to rest for 5 minutes, then flake into large pieces.
Assemble tacos by placing pieces of mahi mahi onto warmed corn tortillas. Top with salsa and serve.