Question

I am developing an extension to firefox that indicates to the user what is the strenght of his passwords.
For instance, the user inserts a password on a password field and the extension will measure password strenght immediately.

What shoul I overlay, ths browser.xul?

What events should I use?

Thanks.

Answer 1

You should probably add an event listener for the window “load”. This will be called on each new page load.

Then inside the load handler, you would find any controls that are password controls. And for each password control found, you would add an event listener for when any text is changed.

Inside your handler for the password change, you would update your password strength meter.