To access the Pop-up Blocker settings:
Step 1: At the top of the Firefox window On the menu bar, click on the Tools FirefoxEdit menu, and select Options... Preferences....Step 2: Select the Content panel. Step 3: In the content panel, click Exceptions, the following display will show. Step 4: Type in the Merco URL. Example: http://localhost/MercoStep 5: Click Allow.