Consult of "Request in browser"

[tXambe]

Hello,

I have installed Burp Comunity version 2020.5.1 in Windows, when search XSS vulnerabilities wtih XSSValidator when I select "Request in browser" always open this web "https://portswigger.net/burp/documentation/desktop/getting-started/proxy-troubleshooting" I have installed the CACERT.der of burp in Firefox (77.0.1) Brave (0.62) and Edge Versión 83.0.478 and in all three the same result.

Can anyone help me ?

Thanks and a greeting