Dice the ripe mango into small cubes.
Combine mango, finely chopped red onion, chopped cilantro, and freshly squeezed lime juice in a bowl.
Toss everything together until evenly mixed.
Season salmon fillets generously with salt and pepper on both sides.
Drizzle olive oil over the salmon.
Preheat grill or skillet over medium-high heat.
Place salmon skin-side down on grill or pan, cooking for about 5-7 minutes until golden brown and cooked through.
Remove salmon from heat and let it rest for a minute.
Spoon mango salsa over each fillet.
Plate salmon with fresh mango salsa alongside some steamed veggies or rice.
Serve immediately while warm.