I had to make Chrome the default. It makes me sad.
For a long time now, Firefox opens so slowly compared to Chrome or IE, even in safe mode with all add-ons disabled.
On my clients' computers they often have to shut it down from the task manager after closing it when they later try to open it because FF did not properly unload from memory. It appears to happen most often on slow computers.
I also could not understand the narrator of the video.