We've discussed at length in previous threads how difficult it is to leave AOhelL. Now you can read their Retention Manual and feel vindicated that it's not just difficult operators. It's company policy!
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." --Rick Cook
My first thought would be to check for a stuck key on your keyboard. But if it's happened on multiple computers that's out. Do you use any/some/lots of Firefox extensions? Are any or all of them common to the various computers?