What's your computer system and Firefox version? Type '''about:preferences#advanced'''<Enter> in the address bar. Under '''Advanced, ''' Select '''Network. ''' [56+] Type '''about:preferences#general'''<enter> in the address bar. Look for '''Network. ''' +++++++++++++++++++++ Look for '''Configure How Firefox Connects''' and press the '''Settings''' button. If you are using a proxy, make sure those settings are correct. If there is no proxy, first try '''No Proxy. ''' If there is a problem, then try '''System Proxy. ''' ------------------- 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}