This project is a Ghidra script that is used to detect double free vulnerabilities within 64-bit PE or ELF applications. Check out the blog post on this script to learn more about how it detects these vulnerabilities.
https://www.automox.com/blog/double-free-vulnerabilities-ghidra
Place the script within the Ghidra scripting folder. Then within Ghidra, run it via the Window -> Script Manager.