Browser Compatibility

Windows 7 users have been getting the "Update Browser" nag screen, but estimates from AI indicate that as much as 20% of PC users still use Windows 7, and Firefox just updated its browser to Version , which was first offered to ESR channel users on November 11, 2025 — so it is up to date, and it works really good ( for me ).

These factors mean that making Chess.com backward compatible with Firefox and earlier versions of Chrome would be advantageous. If the advertisers don't like that because their exploitative code doesn't work as well on them — make them adapt instead of PC users.

After all, it's not just a  "Browser upgrade" — to upgrade to those browsers the entire OS has to be upgraded, and that can sometimes mean a whole new PC. So it's not really about "safety". It's more big tech BS to push users into having to spend money on their products while giving advertisers more ways to exploit consumers.

Not "fun" — and you seem to have missed the entire point. Whether or not a browser is "supported" by an OS company doesn't mean millions of people no longer use the browser or the OS. Additionally, as I stated, the Firefox browser is fully updated and compatible with Win7 as of November 2025. So what's the point of the nag screen?

What is a "Fun fact" is that there's been a significant uptick in users going back to Win7 due to their dislike of the latest Windows version — and they're trying to explain it away as a technical glitch

The site won't maintain code to work with really old browser versions, at least not long term. They also have stats on how many users are on which browser versions, so if a sufficient number are on a version, they likely support that unless that version doesn't support specific features the code requires

If you look closer you will notice that chess.com is a commercial company as well