hello grinboj, please also try creating a new profile like explained here: Profile Manager - Create, remove or switch Firefox profiles

It doesn't work again.When i try to create new profile it just pop out a Mozzilla crash reporter.

Did you try to disable hardware acceleration?

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can also check for problems with plugins.

• https://support.mozilla.org/kb/Troubleshooting+plugins

Do a malware check with some malware scanning programs on the Windows computer.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.

• http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
• http://www.superantispyware.com/ - SuperAntispyware
• http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner
• http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
• http://www.safer-networking.org/en/index.html - Spybot Search & Destroy

You can also do a check for a rootkit infection with TDSSKiller.

• http://support.kaspersky.com/viruses/solutions?qid=208280684

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

then you can try to manually trigger the creation of a new profile:

press the windows key + r and open %appdata%\Mozilla\Firefox. a windows explorer window should pop up, in there rename the file named profiles.ini into something like oldprofiles.ini and try launching firefox again.

please also do a full scan of your system with your security software already in place and/or a different tool like the free version of malwarebytes.