MBP Freezes after login

Used Firefox, when suddenly the computer was unresponsive.. so had to hard boot.
Now when i startup it freezes after approx. 20 sec. after the login is shown.
If i don't login the computer freezes at the login, and if i login finder freezes.
There is no problem when starting in "safe mode"...
Anyone have a solution to what i can do??
Regards
Jens

I had the same issue as all of you guys. Here is what really worked for me and though of sharing with you
  Just as you could before, you can boot into Yosemite’s Recovery partition by holding down Command-R at startup, and in the OS X Utilities window that eventually appears, click Reinstall OS X, and then click Continue. This launches the OS X installer, which will download a fresh copy of Yosemite and install it on your startup volume.
Alternatively, if you no longer have the original Yosemite installer that you downloaded from the Mac App Store, you can get another copy by selecting App Store from the Apple menu, clicking on the Purchases link, and clicking Download next to the OS X Yosemite entry.
If the word Download doesn’t appear next to the installer, it means that the App Store believes you have a working copy of the installer already on your Mac. You should locate that copy and if you don’t want to use it—because it’s now a couple of point-releases old, for example—either compress it or remove it from your drive. Once you do, you should be able to download a fresh copy from the Purchases page.
The reinstallation might take up to 8 hours. After the reinstalling the OS I have no issues anymore !!! Hope this will work for you too !
All the best !

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    Nov 25 22:02:19 Joe-Heafners-MacBook-Pro /System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport: Currently connected to network Joe's Network

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