Just how do you "fix a segfault" in your page? Do you immediately replicate the user's exact computing environment, all down to the specific operating system and perhaps browser plugins which might contribute, install a specific version of the this obscure browser (Conkeror?) with debug symbols, fire up GDB and understand why the complex C++ crashed based on the core dump?

That seems like an unlikely amount of effort. IME If you have some "enterprise" tool with enterprise clients, there's typically going to be a list of browsers which are supported and tested by QA.