All of a sudden Firefox started to act very strangely on my computer. If I reboot my computer Firefox will initially work normally for about 5 minutes, after that it just won´t work to load and open any webpage, Firefox is acting like the computer is offline, it just keeps loading but cant open any webpage. I know my internet connection is alright since other browsers like internet Explorer is working fine. Another weird thing is that I am also not able to close down the Firefox processes in the task manager if I close down the browser, this makes it problematic to reboot Firefox, because an error message tells me that Firefox is already running, yet i can not close down the processes, the only way to really close it seems to be to reboot the computer. I have also tried to reinstall Firefox but the problem remains the same. Firefox is my prefered browser, so it would be really great to get it functioning normaly again.