Each time I click on a link inside, it opens up in its own browser. How do I change the default browser to Firefox?
Thank you.
Prism is stripped down Firefox under the hood, that is why it is available in 2 flavours, FIREFOX plugin or stand alone (FF under the hood).
You cannot change it in its current release.
Here are more details:
Prism is a simple XULRunner based browser that hosts web applications without the normal web browser user interface. Prism is based on a concept called Site Specific Browsers (SSB). An SSB is an application with an embedded browser designed to work exclusively with a single web application. It doesn’t have the menus, toolbars and accoutrements of a normal web browser. Some people have called it a "distraction free browser" because none of the typical browser chrome is used. An SSB also has a tighter integration with the OS and desktop than a typical web application running through a web browser.
I think it uses the default browser on your system. This will depend on what OS and environment you're running (Windows? OS X? KDE/Gnome on Linux?).
On Windows, go to Control Panel -> Programs -> Set Default Programs, select Firefox, and set as default.