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&#46; 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&#46;e&#46; you are running the latest version)&#46; * Remove Firefox from your program's list of trusted or recognized programs&#46; For detailed instructions, see '''[https://support&#46;mozilla&#46;org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet&#46;]''' {web link} -------- ''<p>jscher2000 [[#answer-1481976|said]]</p>'' <blockquote>Could this be relevant? A couple of other users identified Webroot (security software) as blocking 64-bit Firefox 97 -- released today -- from running properly: * https://support.mozilla.org/questions/1367248 * https://support.mozilla.org/questions/1367301 If you are still running an earlier release of Firefox, this would not be your issue. </blockquote> ''<p>bg07901 [[#answer-1482491|said]]</p>'' <blockquote>After consulting with WebRoot, they advised this was a known issue. The fix was to remove and reinstalled the WebRoot application. </blockquote>

in case you do have Webroot. https://www.mozilla.org/firefox/97.0.1/releasenotes/ Fixed Works around problems with WebRoot SecureAnywhere antivirus rendering Firefox unusable in some situations