For some time past, when logging in on my PC, once I place the cursor over the username box, my full username appears as a prompt. I can live with this, though I'd prefer it didn't happen. However, for the past week this feature has extended to the password box. Now when I input the first character of my password in to the password box, the whole password appears as a prompt, visible to anybody. Which, for me, is security issue. Can I disable this feature?