I developed a website using c#, razor, javascript/jquery, css.

When I browsed my webpage using Firefox, the below warning a get displayed on the front page.

"You are using a web browser that is not supported by this website. This means that some functionality may not work as intended. Use Chrome browser to take full advantage of this website."

How can I handle this? Is there any way where we can detect which line of code is not compatible with this browser or any other browser?

How can I make the warning disappear on any browser?