The problem is not these things fighting with each other, but fighting with the webpage design. It's fine if a contact form pops up over an email opt-in form, i

The problem is not these things fighting with each other, but fighting with the webpage design. It's fine if a contact form pops up over an email opt-in form, if the contact form is the more recent thing someone tried to open. It's not fine if the contact form appears behind the website's navigation menu because the website template designer gave the menu too high of a z-index value. Separating these third party overlays from the webpage is the improvement this offers.