To enable pop-ups in Firefox: From a PC:

On the menu bar, click on Tools button (or Tools Menu), and then click on Options.
Next, click on the Content tab.
Block pop-up windows: You can uncheck this to disable the pop-up blocker altogether
from any website,or you can leave the box checked and click on Exceptions.

Exceptions: This is a list of sites that you want to allow to display pop-ups. To allow pop-
ups from the Lexington Aspen site, enter https://ma-lexington.myfollett.com in the box

for address of website; click allow; then click Close.