Why does Firefox keep doing this?

[Charlie]

I'll leave my computer for a couple minutes with my firefox browser open and I come back and it's been closed. Usually when it crashes it has a little pop up that says "Firefox has crashed bla bla bla" and what not. But not here, not the last three times this had happened. I reopen it and I have to restore my previous session all over again. It's frustrating me.
@leona,

Thank you very much! I was certain I wasn't even going to get an answer since most of these sections are so dead. I appreciate it. Do you remember what specific programs you had to delete by any chance? Thanks again!