Very recently when typing an email in Firefox, if I make a typo and try to backspace to correct, I get a sound and it will not backspace.
I am on MacBook running on OSX 10.6.8. When I'm typing an email, if I make a typo and try to delete it or backspace, all I get is a computer sound and it will not allow me to do anything. I have to close that page and start over completely. It will not do it every time but does it frequently. I don't know what triggers it and how to make it stop.