Firefox UI XSS leading to RCE

Cross-Site Scripting can be taken to crazy levels!

"With an Cross-Site Scripting (XSS) in the user interface attackers can execute arbitrary code in the context of the main browser application process.
This allows for cross-platform exploits of high reliability."

"Listen, well, young folks. Old people, browser hackers or Mozilla fanboys, might use this as an opportunity to lean back and stroke their mighty neckbeard, as they have heard all of this before" ...