To edit pop-up blocker settings, please follow these steps:
Click the Tools menu, select Internet options.
Click on the Privacy tab.
Under the Pop-up Blocker heading, click the Settings button.
In the Address of website to allow box, type static.practicefusion.com and then click Add.
You can then close the Internet Options menu.
At the top of the Firefox window, click on the Firefox menu button (3 horizontal lines) and then click Options.
Select the Content panel and click the Exceptions button on the top right.
A dialog will appear that shows all the sites that are allowed to show pop-ups.
In the Address of website box, enter static.practicefusion.com. Then select Allow and Close.
Click OK to close the Options window.
Click the 3 horizontal lines in the top right corner on the browser toolbar.
Select Settings (Preferences on Mac).
Click the "Advanced" dropdown arrow at the bottom of the page.
Choose the Content settings in the "Privacy and security" section.
In the Pop-ups section, click "Add" next to the "Allow" section.
In the "Site" field add static.practicefusion.com and click Add.
You can then close out the settings window.