A new browser engine? With all new bugs and exploits? No thanks. Old code is good code.
Not sure I agree with you there. A new engine means new bugs. An old engine means old, undiscovered bugs that have evaded Mozilla / white hats.
Hopefully the new engine is written by people who have bugfixed old engines for some time so we don't end up with a situation like in the car industry where apparently complete newbies write software that can be attacked through open communications systems, etc.