Fails to clean Firefox at all.. Win 8.1 FF 37.01

Ccleaner v5.04.5151 64-bit runnnig on windows 8.1 pro x64 cannot clean cookies etc on Firefox 37.01. I do not know if it is failing IE11 and Chrome since I have not used either of those in awhile.

I use Firefox both in normal mode and in their Privacy mode. I have all options checked in CCleaner under "Applications / Firefox" tab.

CC runs per normal, reports what it did, no crashes or anything, but when I reopen firefox, i'm still logged in all over the web....

You need to make sure when exiting firefox that it is fully exited (no firefox.exe plugincontainer.exe or any other Mozilla based programs listed in the detail or processes tab of task manager) before running the cleaning