Thanks Jussi,
It was not showing anything in the console as the form was not allowing any action on clicking the link.
I found that there was a tag <Base target="_top"> in the all the customised list_xx.htmpl forms. After removing this tag, it started working in Firefox now. We have migrated CA Service Desk from 12.6 to 14.1. So during customisation of forms, I kept that tag in the 14.1 forms and this was the reason behind this.
Regards,
Balram Deswal