A lot of the time I use a computer outside of work, I am alone in a house into which no one can see or I am alone in a house with my partner with whom I share all of my passwords. As such, I'd rather have the option of unmasking my password because it makes things easier for me. I use long passwords and so it's not rare (though neither common) for me to type it wrong so I end up typing my 'password' 4 or 6 times.
There are probably purpose-built plugins to show passwords, but you can also use the very popular Web Developer plugin if you use Firefox -- to make password fields visible, in the context menu hit:
> Web Developer > Forms > Show Passwords
You can also type your password into the username field first, then cut & paste it into the password field before entering your actual username.
Some years back while traveling and using dubious internet cafes I used to (I imagined) defeat keyloggers and at the same time navigate foreign keyboard layouts by typing my password mixed-up into the username field, then copy/pasting it a piece at a time into the correct order in the password field.
