As of 2016-03-01, Microsoft Edge in Windows 10 leaks Global Atoms. Document titles are registered in the Global Atom table, and they are left there forever.
Explorer cannot work properly without some room in the Global Atom table. When it is full, it cannot show context menues (right click menues.) Some applications, especially those written in Delphi, will also be affected.
While you are reading these paragraphs, the javascript code in this web page is constantly changing its document titles, though it might be you cannot see the changes. The document titles are being captured every 0.1 seconds or so by MS Edge, and they are being thrown into the Global Atom table. The 16384 slots in the Global Atom table will run out in about 30 minutes. Wait patiently until your Explorer gets insane!