Notice that this only crashes on an out–of–date kernel. No matter how much money Google has, you cannot expect them to test their websites in every combination of browser and kernel version. Not even on a handful of carefully–selected kernel versions. Maybe Mozilla should test Firefox on more kernel versions (an argument could perhaps be made for testing the older kernels from various distros with long–term support, for instance), but really the whole reason Firefox has crash reporting is to catch the really weird combinations that happen in real life but are hard to continuously test for.