Is what you mean same with following thread? He has an video attached.
http://forum.maxthon.com/index.php?/bug-tracker/general-support/auto-reload-facebook-picture-r236/
It's really sad story, but anyway we need to solve it.
Let me check another detail with you, did all these problems (crashing when close a tab, freeze on Fav. manager) happen only when you have one or more Facebook page on?
If so, we may suppose that MX4 encounter problem when Facebook was open, and given the problem has happened, what other operation you do after that will meet difficulties.
Besides, what's your operation for Fav. manager? only click open, and it will be slow or freeze? or only when you edit it, it encounter problems?