On the menu bar, click on the Firefox menu and select Preferences.... Select the Content panel. 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.
146 Maple Street, Lexington, MA 02420 Phone: 781-861-2580 | Fax: 781-863-5829