Try to reset (power on/off) the router. *http://kb.mozillazine.org/Error_loading_websites

What happens when you try to access other sites? For example, do you get a specific error page (e.g., server not found, page not found), or a blank page, or just nothing? Do your bookmarks still work? Does a direct link separate from Yahoo search results (e.g., [https://www.mozilla.org/]) work? ---- By the way, what version of Firefox do you have on your Vista computer? It should be the Extended Support Release of Firefox 52. Other recent releases are not compatible with Vista. If you can open the Troubleshooting Information page, that information should be provided in the first table there. Either: * "3-bar" menu button > "?" button > Troubleshooting Information * (menu bar) Help > Troubleshooting Information * type or paste about:support in the address bar and press Enter "Channel" will reference "esr". If you want to take home an installer for that release "just in case" you can download it from the following page: https://www.mozilla.org/firefox/organizations/all/ Please choose the regular Windows version (32-bit) for maximum compatibility unless you've already been using the 64-bit version.