The pauseOnFocusLoss does not work in Chrome and Edge

**Do you want to request a _feature_ or report a _bug_?**
Bug

**What is the current behavior?**
I've tested on Chrome, Firefox and Edge if the pauseOnFocusLoss property (which is true by default from what I've read) works as expected, but in Chrome and Edge it doesn't stop when the tab where the toast was displayed is changed. On Firefox it worked fine.

The behavior can be replicated with the react-toastify doc site itself.