Firefox 29.0.1 does not always close properly upon exit. It will occasionally hang (4 or 5 times a day) and the process stays in memory. I have to go to the Windows Task Manager in order to kill the process and restart Firefox. Also, page load times seem to have noticeably increased from the previous version. Here is some relevant system info: OS Name Microsoft Windows 7 Professional Version 6.1.7601 Service Pack 1 Build 7601 OS Manufacturer Microsoft Corporation System Manufacturer INTEL System Model DZ77GA System Type x64-based PC Processor Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz, 3501 Mhz, 4 Core(s), 8 Logical Processor(s) BIOS Version/Date Intel Corp. GAZ7711H.86A.0063.2013.0129.1913, 1/29/2013 SMBIOS Version 2.7 Windows Directory C:\Windows System Directory C:\Windows\system32 Boot Device \Device\HarddiskVolume1 Hardware Abstraction Layer Version = "6.1.7601.17514" Installed Physical Memory (RAM) 8.00 GB Total Physical Memory 7.97 GB Available Physical Memory 6.09 GB Total Virtual Memory 15.9 GB Available Virtual Memory 13.8 GB Page File Space 7.97 GB Page File C:\pagefile.sys Here are the extensions (All are latest versions) I am running: Adblock Plus Better Privacy Download Helper Flagfox Flashblock Foxclocks Ghostery Image Zoom Noia Fox options NoScript Theme font and size changer Appearance: Noia Fox