Firefox v.13.0.1 was offered to release channel users on June 15, 2012
Fixed in Firefox 13.0.1 
No Security fixes, this release has 3 functionality fixes;
FIXED: Windows Messenger did not load in Hotmail, and the Hotmail inbox did not auto-update (764546, fixed in 13.0.1)
FIXED: Hebrew text sometimes rendered incorrectly (756850, fixed in 13.0.1)
FIXED: Flash 11.3 sometimes caused a crash on quit (747683, fixed in 13.0.1)
Vulnerability ratings: None
Evaluation: Apply the patch if/when it is offered as this update provides some functionality fixes.