I believe this is a better link: <a href="https://www.mozilla.org/en-US/firefox/80.0/releasenotes/" rel="nofollow">https://www.mozilla.org/en-US/firefox/80.0/releasenotes/</a>
It seems to have broken, substantially - it keeps closing (and asking to send a report to Mozilla) pages that worked fine the other day. Hopefully this isn't a new trend.