Problem
In Piwik.js The function beforeUnloadHandler() is entering a semi-infinite loop

Scenario
when the User changes the System Time to some time previous to the current (let's say an hour back in time).
Then the semi-infinite loop starts on the call to beforeUnloadHandler function:
This is due to the part of the code:
do {
now = new Date();
} while (now.getTimeAlias() < expireDateTime);

since the now is not near the expireDateTime, it would take lot's of loops to get to the expireDateTime, mean while the browser is stack.