I don't know if these are the types of crashes being discussed. My FF is 7.0.1. The last few versions, starting with 4, occasionally crash. I notice that if my downloads window is on top and I right click to save another link without bringing the source window to the front, it will shut down all instances of Firefox. I never use tabs. Also, if I'm trying to save another link when the "Downloads Complete" notification pops up, it will crash. I ordinarily run without Javascript enabled.
This might be a Gnome issue. I'm still using Gnome 2. Other than that, everything is updated via Synaptic as of last Monday. I don't have Facebook.
As long as I can get the window focus and the timing right, it won't crash. Just my two cents, adjusted for inflation.