You Said :
"my problem is that when the user clicks the verification link Chrome browser is being initialized."
That is because your default browser is set to Chrome.
To open link in a specific browser Please have a look at the below URL :
Force a Link to open in a specific Browser[
^]
But i think it's not a good idea to force user to open link in specific browser.
Reasons :
1. It is not necessary that user has installed firefox on his/her machine
2. If user has open website in Internet Explorer and through verification link you
open link in firefox then same issue will occur.