I gave Firefox a try yesterday. It crashed four times in a day. I'm switching back to Chrome for peace of mind. Chrome hogs memory but I'd rather suffer memory than irritating browsing experience.
Were you on a fresh Firefox profile without any about:config changes? If not, try that: you may have options set that are overriding defaults, where the defaults don’t crash but your custom choices do.
Did you try Release or Nightly/Developer?