(Pwn2Own) Mozilla Firefox Top-Level Await Prototype Pollution Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Mozilla Firefox. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the Top-Level Await implementation. The issue results from the lack of control over modifications to attributes of object prototypes. An attacker can leverage this vulnerability to execute code in the context of the current process.