Webmail memory leak

Looks like Win10 Webmail has a memory leak.  After leaving Webmail open for a day, I can see in the Task Manager that my browser's memory has exceeded 2 Gigabytes (around 300 MB when first open).  This happens with Chrome, Edge, and IE, so I don't suspect the browser.  The leak grows over time, even if there is no user interaction.  It might have to do with the ads that are displayed along side of the email App, as that is the only thing that remains active during this time.  If I close the browser and reopen, then sign in to Webmail again, I'm back to ~300 MByte.  Anybody else having the same problem?