Security is an important thing for everyone, and it is no different with web-facing pages. These pages are were hackers are fought as thy try stealing company secrets. Because web pages theses days typically leverage resources from multiple origins (domain), this could lead to vulnerabilities.
Webmasters now have a list of different options from browser makers that can help prevent information leaks. These options includes directives for dealing with “cross-origin” resources.
Because CPUs are vulnerable to a timing flaw, they allow access to memory cache where SharedArrayBuffers are storing data.. This means hackers can utilize malware to access both your pages and memory. These hackers can ultimately gain access to any open page on your browser, and that isn’t good.