Hi, I'm Elise, a fellow user like yourself and I'd be happy to help with your issue.
Please follow these steps to disable the Firefox pop-up blocker:
Click the menu button (three horizontal lines) and select Settings.
Select the Privacy & Security panel.
Go down to the Permissions section.
Uncheck the box next to Block pop-up windows to disable the pop-up blocker altogether.
Please let me know if you need any further assistance.
Kind Regards,
Elise