How to make password fields in browsers show plain text?

For Firefox I use the add-on Unhide Passwords.


Show Password (Firefox Addon)

If you are not worried about someone looking from behind your back and stealing your passwords, why take additional pain for typing **** password fields, where you dont know whether you typed your long password correctly or not

while there are many passord revealers available to show passwords stored with Internet Explorer (or other web browsers) as clear text, (to the best of my knowledge) there is no option to show text instead of asterisks while you type the password.