That's not a Firefox browser issue and seems that sites been flagged for security reason even by Chrome.

SECURITY ? For TV Guide ?

Nothing to do with the Firefox web browser nor with Mozilla as the site is done. 

''<p>re105fww [[#question-1502344|said]]</p>'' <blockquote>Try to get "tvlistingszap2it.com" --(which I have been using for 5 years)--- but it opens "newsnation" Started doing this on 17 Mar, 25. What is wrong ?? Can you fix it ?? </blockquote> Nothing to do with the Firefox web browser nor with Mozilla as the site is done. https://cordcuttersnews.com/the-popular-online-tv-guide-service-zap2it-tv-shuts-down-is-replaced-by-newsnation/ https://www.reddit.com/r/cordcutters/comments/1jksy2t/zap2its_listings_dead_site_redirects_to_newsnation/ from https://en.wikipedia.org/wiki/Zap2it <blockquote>By March 25, 2025, with only the TV Listing section remaining, Zap2it was finally shut down for good. The domain now redirects to the owner of Zap2it, NewsNation TV Schedule.[6] However, since its listings section was sourced by Gracenote you can still access them via the external link below and login using your Zap2it credentials. </blockquote> From the reddit thread there was this link https://tvlistings.gracenote.com/grid-affiliates.html?aid=lat