Henrik is right. Frankly, I switched to Firefox precisely because I could expect quick response to critical bugs. I remember some critical (and actively exploited) IE security holes that got fixed only when Hull (Québec) Froze Over, eight months or more later. I'm aware of exploited criticals it took MS years to get around to addressing.

2.0.0.x has been feature-locked since 2.0.0.8 or .9. What you're seeing now is critical bugfixes, the stuff that can't wait, and whatever less-than-critical problems were solved in the mean time. It just happened that two problems were picked up in rapid succession.

Mozilla is doing exactly the right thing. It's not as if the update installs are problematic. Just click if you want the updates now (and a minute later have your web pages brought back, ready for more browsing) or later, next time you turn it on.

__________________
And you, to whom adversity has dealt the final blow
With smiling [faces] lyin' to ye' everywhere ye' go
Turn to, and put out all your strength of arm and heart and brain
And like the Mary Ellen Carter, rise again.