Who's using a browser from 2013? When I said I'm running Windows 7, I'm specifically talking about the OS, including an awful lot of updates it's had since 2013, not all software I run on it. Updates added such things as support for the later versions of TLS, several years ago. Although Google and Mozilla have dropped official W7 support from Chrome and Firefox, there are forks that add it back, which is why I'm running up-to-date browsers.

If we were talking about even older browsers though... 20 years ago, because of the insecure way browsers generally worked, everybody used third-party antivirus or e.g. Norton Internet Security, which seemed to cause as many problems as it solved. But browsers (and OSes) haven't been so open for years - we don't have quite that class of problems anymore, where just visiting a site was enough to get the browser to download and run all sorts of nasties. I don't remember quite when it was that we'd left the most dangerous period behind, when the security of browsers and OSes had been considerably hardened, but it was before 2013. Windows 7 was, and is, much safer on the network than XP, by design.