To configure the Firefox pop-up blocker on a Mac:
1) Click on the Firefox menu, then click on Preferences
2) Click on the Content icon on the top. Now click on the Allowed Sites button (next to Block Popup Windows)3) Type the webmail address into the Address of web site: box. This will add it to the list of allowed web sites in the box below
4) Click Close and then the OK button to finish
