Title describes the problem, which started with FF 17. I originally asked about this at: https://support.mozilla.org/en-US/questions/942316?esab=a&as=aaq My concern is that, while many people contributed and Mozilla developed a solution (thank you to all!), the thread was closed with a "chosen solution" that does not describe exactly what the user needs to do to fix the problem. The required changes were described in a little more detail in posts made shortly before the thread was closed, but even those may not provide sufficient explanation for many users. I don't know if I'm approaching this the right way, but I wanted to provide the step-by-step instructions for remedying this issue, for those who might need them.