'''What error messages are you receiving ??''' -> Tap '''ALT''' key or press '''F10''' to show the Menu Bar -> Update ALL your Firefox Plug-ins https://www.mozilla.com/en-US/plugincheck/ -> go to Tools Menu -> Clear Recent History -> '''Time range to clear: select "EVERYTHING"''' -> click Details (small arrow) button -> place Checkmarks on '''Cookies, Cache''' -> click '''Clear Now''' -> go to Tools Menu -> Options -> Advanced -> Network -> Offline Storage (Cache): click '''Clear Now''' button -> Restart Firefox If it doesn't work, see this: Firefox cannot load websites but other programs can https://support.mozilla.com/en-US/kb/Firefox%20cannot%20load%20websites%20but%20other%20programs%20can Check and tell if its working.