The first loads for me without any apparent issue. The second loads but asks for a "security check" before allowing me to proceed. You could try clearing the cache then deleting Cookies. If that doesn't work, try right-clicking the site in History then ''Forget about this site''. Make sure you have a backup record of your user name and password before doing that because they will be forgotten also. https://support.mozilla.org/en-US/kb/how-clear-firefox-cache https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox#w_remove-a-single-website-from-your-history ---- If none of those fixes the issue, try restarting in troubleshoot mode. https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems (also deals with hardware acceleration) https://support.mozilla.org/en-US/kb/troubleshoot-issues-related-to-add-on ---- If all that fails, try creating another profile. In the first article linked below there are sections telling you how to open the profile manager with Firefox open or closed. https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles See the other articles for copying data from the old profile to the new profile. You need to do that with Firefox closed. https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data#w_finding-your-profile-without-opening-firefox

The archive site is not compatible with Cloudflare DNS, you can switch [[Configure DNS over HTTPS protection levels in Firefox|secure DNS over HTTPS (DoH)]] to "Max Protection" and select NextDNS instead.