To open a web page in firefox by clicking an anchor tag

Question

I am here to give u question. that is beyond exception but i think somebody will have answer for this.

Question: Once user clicks an anchor tag

Answer 1

If you mean exclusively in Firefox, it can't be done.

Best you can do is hide it from other browsers by sniffing the user agent if the browser is not Firefox. But a different browser can easily present itself as Firefox (by spoofing the user agent).

Either way, it is not a good idea. Why is Firefox required to view your page?