Am new to Mamp Pro though I've been using plain Mamp for a while. Using MacBookPro running Yosemite.
Mamp's default localhost server is working fine and in a browser I can open subfolders living in htdocs with no problem and they behave like sites.
But I set up a virtual host in the Mamp Pro interface, e.g., clientname. The folder 'clientname' lives in the Mamp htdocs folder. Have restarted Mamp. When I try to view the site (clicking on the arrow in the Mamp Pro interface) in a browser (Firefox) it wants to download a file rather than opening the home page. Safari simply shows a blank page.
What am I doing wrong?