Firefox not loading websites

[ColinBird]

I have just installed Firefox on a new iMac, running MacOS 15.2. Firefox will not load any of the websites I have tried, whereas Safari and Chrome do. I have cleared the History and also set "No proxy" but loading still fails.

I am having to post this issue using Safari, as Firefox will not even load https://ideas.mozilla.org.

This problem has become a real concern to me, as I have come to rely on a number of Firefox and have numerous useful websites bookmarked, so I would very much appreciate a solution. Thanks in advance.

[ColinBird]

Hi Paul,

Replying to the question you emailed, "Is there any error message shown?", no, the dot to the left of the tab name goes side-to-side for a while the stops, leaving a sand-timer icon but the pane remains blank.

Thanks - Colin

[ColinBird · Accepted solution]

Problem solved, by pure chance! In the process of fixing an unrelated issue, I had to install Apple's Rosetta software (my previous iMac was rather old: 2013). When I next checked Firefox, it was working as normal, so the problem must have been compatibility-related.