How to fix Software is Preventing Firefox/chrome From Safely Connecting to This Site in Burp Suite

The cause of the problem is that your browser don’t trust that certificate. To fix this error follow the following steps

Open settings in browser

Open settings in browser and search for certificate > view Certificates > Authorities > select your portswigger certificate

Choose to Edit Trust..

Select This certificate can identify websites option

Click ok and now the problem is solved. And you’ll be able to intercept traffic successfully.