Please check the version of Fire Fox you are using. Please update it, if it is out-dated. Please clear the cache regularly, for improving the speed of your browser.

Sorry, but apparently there was a problem with Mozilla's service that updates the "snippet" that appears below the search box. If you happened to open Firefox at the wrong moment and got the bad snippet, you need to clear it out to resolve this issue. Could you try the solution in this thread: Firefox hangs on the default Start Page.