The worst bugs are often the ones that have trashed some of the stack or ended up with some rubbish register state too, and so being able to try and get some us

The worst bugs are often the ones that have trashed some of the stack or ended up with some rubbish register state too, and so being able to try and get some useful information out of a seemingless garbage dump is critical. I imagine a project like Firefox is also big enough to see bad things happening because of incorrect CPU behaviour and bit flips and such too...