Firefox freeze on startup, no error message

Firefox from one minute to the next crashed. Everytime I opened it up, it became unresponsive. Never an error message, just a pure freeze. The CPU does not go into overdrive. I did a complete uninstall. Created a new profile. As soon as i closed my session, the problem persisted. Even in safe mode, the application freezes completely within 1-3 seconds.
Using the latest firefox
windows 7 up to date

Hi,
1) I tried Installing Firefox 18. The problem persists.
2) Since the problem occured, i have installed chrome, opera, safari and all of them work. I have so far not experienced any problems.
3) Here is the info you requested:
Windows 7 Ultimate
Service Pack 1
System type: 64 bit
Firefox versions used:
17.1
18
4) Here is a more detailed description of the problem.
After uninstalling firefox, i reinstall it using the 18.0 version. It installs without a problem. Once the installation is complete, a firefox window opens up and works. I can do anything i want. Once i quit firefox, every new instance i open freezes:
- Normal mode: Freezes when i click on the + sign for a new tab or click on the address bar or just wait a couple of seconds.
- Safe mode: I try and open it up in safe mode, a window appears asking me if i want to open it in safe mode or reset firefox. If i click on reset firefox, the window disappears, a firefox process in open (task manager) but no window opens.
- Reset firefox. If I try and reset firefox, the window asking me if i want to open it in safe mode or reset firefox. Upon clicking reset firefox, a new window opens warning me that doing so will delete ... when i click ok, the window closes, however the original window asking me if i want to open it in safe mode or reset firefox freezes.
5) I never get an error message. Where are they kept so that i can attach them.
6) I installed the recommended "SUPERAntiSpyware Portable Scanner Personal Edition" and "Malwarebytes Anti-Malware users". I let those run through the night and removed some threats. This solved the problem after i restarted and reinstalled firefox. Hopefully this was the last time I have this problem again.
Problem fixed. Thanks for the support

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Firefox freeze on startup, no error message

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