Line a 9x13-inch pan with parchment and lightly butter it.
Toast the topping coconut in a dry skillet over medium heat until golden, 2–3 minutes. Set aside.
Melt the butter in a large pot over low heat. Stir in the salt.
Add marshmallows and cook on low, stirring, until fully melted and smooth. Remove from heat.
Stir in coconut and vanilla extracts until combined.
Fold in the crisp rice cereal and shredded coconut, mixing gently until evenly coated.
Scrape the mixture into the prepared pan. Press lightly with a buttered spatula; do not pack hard.
Sprinkle toasted coconut on top and press gently. Cool 30 minutes, then cut into squares.