What's your computer system and Firefox version? https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can I take it you can access the web using another browser, Yes? Press the '''Alt''' or '''F10''' key to bring up the toolbar. Select '''Files.''' Make sure '''Work Offline''' is not clicked. +++++++++++++++++++++++++++++++++++++++++++++++++ Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again; * Make sure your Internet security software is up-to-date (i.e. you are running the latest version). * Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see '''[https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet.]''' {web link}