An updated version of the classic Password Hasher add-on compatible with the new Webextension-API.

1. Install the Firefox add-on
2. Check the global add-on-settings

1. Open a login page with a password field
2. To open the hasher do one of the following:

• Click on the password-hasher-icon in the address-field of your browser
• Use the keyboard-shortcut Ctrl-Shift-F6
• Click on the "#"-symbol in or near the password-field
• Use the right-click contextmenu on the password field to open password-hasher

3. Enter your master-key
4. Click ok or enter: Done!

The hasher is generating a unique password for every site you visit. This works simply by creating a so called hash from the site-tag and your master-key. The site-tag is extracted of the domain and stored so it stays the same on every visit of this site. Together with your master-key (which is not stored) this results in a reusable hash:

You are visiting the login-page of https://www.github.com. The site-tag github is extracted from the domain. Now you enter your master-key.

site-tag: github
master-key: password
resulting hash: fnD'7ayb4nATjvdX

The resulting hash is now used as password for your github login. Now you are moving on to another website https://www.heise.de. The extracted site-tag becomes now heise. By entering the same master-key you'll get a different hash:

site-tag: heise
master-key: password
resulting hash: 0"Ajd0PqrldvYjeA

Bam. Different passwords for every site. You only have to remember your master-key which is never stored anywhere.