<i>'''WARNING from the moderator team:''' Changing Firefox pref from the about:config page can sometimes break Firefox or cause strange behavior. You should only do this if you know what you're doing. Please read [[Firefox Advanced Customization and Configuration Options]] to learn more. </i>

''<p>rayafe9776 [[#question-1389464|said]]</p>'' <blockquote>People are having connection issues on firefox https://www.reddit.com/r/firefox/comments/x1um0o/browser_problems_after_1040_and_10401/ A fix for this is going to about:config network.dns.disableIPv6 and set to true Disabling ipv6 is a fix, but is this safe? I think mozilla team should look into what exactly is making ipv6 cause connection issues. </blockquote> This is a known issue for some systems and the [[Firefox can't load websites but other browsers can]] Mozilla Support article suggests the about:config solution. See https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can#w_ipv6 As for Mozilla looking into the issue, I found ''[https://bugzilla.mozilla.org/show_bug.cgi?id=300302 Bug 300302] network.dns.disableIPv6 should be set to true by default (at least on OS/2)''. I also found this meta bug that links to other related bug reports: ''[https://bugzilla.mozilla.org/show_bug.cgi?id=136898 Bug 136898] [meta] IPv6 support'' (see [https://bugzilla.mozilla.org/page.cgi?id=etiquette.html Bugzilla Etiquette] before commenting in bug reports.)