I am using Firefox 18.0.1 and when I navigate to a webpage the navigation circle continues to rotate even after then page as loaded. And many websites do not load at all or after many retries, Hotmail is an example. After multiple retries it will load but even when it has loaded the circle continues to rotate and many of the links on the page do not navigate so I can not open my mail. Many other websites do this also they appear to load but the wait circle continues to rotate and many of the links on the page will not work. I have removed and re-installed and IE8 and Chrome are OK. I have disabled my Avast anti virus to see if this makes a difference and it does not.