In JavaScript, the !! (double negation) operator is used to convert a value to its corresponding boolean representation. It essentially converts any truthy value to true and any falsy value to false.

Here's how the expression is evaluated:

1. "false" is a non-empty string, which is considered truthy in JavaScript. So, !!"false" evaluates to true.
2. Similarly, "true" is a non-empty string, which is also considered truthy. So, !!"true" evaluates to true.

Therefore, the comparison !!"false" == !!"true" is essentially comparing true == true, which evaluates to true.

So, the output of the given code will be:

true