And who uses Yahoo anyway?
This is the simples option, not always help but we encourage to try.
- Copy and paste in address bar about:support - Select following http://nimb.ws/Vm5pjy - Rename this folder to any name and restart Firefox http://nimb.ws/awxfuW BUT don't delete it. Just rename.
If it won't help, let us know.
Customer support service by UserEcho