Allow Popups in Mozilla FireFox Browser

Open Firefox browser window.

Click in the upper right hand side of window on the lines and click on “Options”.

Click on Content tab and click on Exceptions… button.
Type in the url in the box and click on Allow.
Now you will see the site listed in the box. Click the Close button.
Click the OK button. 
Now you can print in the Travel Tracker applications. Printing opens up a new tab or window so you must allow pop-ups.