Just updated yesterday to 72.0.2/64 bit. These are the fixes:
Version 72.0.2, first offered to Release channel users on January 20, 2020
Fixed
- Various stability fixes
- Fixed issues opening files with spaces in their path (bug 1601905)
- Fixed a hang opening about:logins when a master password is set (bug 1606992)
- Fixed a web compatibility issue with CSS Shadow Parts which shipped in Firefox 72 (bug 1604989)
- Fixed inconsistent playback performance for fullscreen 1080p videos on some systems (bug 1608485)
I think that the site opening issues may be hidden in their jargon. I've not had any problems as Firefox has operated pretty seamlessly since Ver 2.0.0 for me.