When I open Facebook is Chrome 64 freezing 3 or 4 seconds later. After closing and restarting Chrome without facebook it works fine.

I have opened Facebook in Firefox. Chrome is working in background. When I get a privat message in Facebook on Firefox was opening a little message box to inform about this message. When I click on this box, loads Facebook in Chrome and come from background to foreground an freeze some seconds later.

Sorry for my bad English.