Place the chopped shrimp in a medium bowl. Add lime juice and salt, then toss to coat. Let rest for 10 to 15 minutes.
Add tomatoes, red onion, jalapeños, cilantro, green onions, and avocado. Gently stir to combine.
Cover and refrigerate for at least 30 minutes, preferably 1 hour, to allow the flavors to develop.
Serve chilled with tortilla chips.