Problem clicking link in email

[pgold95]

When I click a link in an email or some other application, rather than opening in a browser, it gives me a pop up that says "Firefox is already running, but it is not responding. The old Firefox process must be closed to open a new window" This is a bit of an issue. Right now I need to copy the link and then paste into Firefox to open. With Chrome, when you click on a link it will open in which ever instance was the most recently active. To make it better in FF, it would be great if I clicked on a link and it then gave me a choice of instance and then opened in that window.

[Noitidart]

Thanks you so much @pgold95! :)