A lot of the weird bits in the Breakpad codebase were definitely from us finding extremely broken minidumps from Firefox users in the wild and then me tweaking the code to see if we could get something out of it so we had a chance at diagnosing the issue.

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...