I leave a browser open to the site all the time, often on a Vista machine. I check in daily, but don't always post. All I remember was Pale Moon declaring the site as malicious and wouldn't allow me to login, but on IE 8 it worked fine, with Javascript turned off. Pale Moon is derived from modern Firefox but looks like Firefox 3.x, so it falls victim to all the 'Quantum' idiot proofing.
During the same time, MS Edge on a Windows 11 machine had its own 'this site is not safe to visit' error page. It was not showing from the site, but a local MS Edge error page according to the URL. Not even 'internet explorer mode' fixed it. I had to sideload Firefox 3.x from 2010 and it worked then, with Javascript disabled. (with it on, you can't get the text box to post things to display)
Any time I got met with a 'this site is down for maintenance' it was fine if I refreshed. That happened if the PC went to sleep, for some reason, and I woke it up, the browser would show that for a second and would auto-refresh or let me manually refresh and it loaded fine.