How to avoid auto complete with Passwords?

Currently when I edit my profile in ES, I'm continually forced to remove my password with each edit due to auto complete. Here's what happens when I forget to remove my password:



This problem occurs in FireFox 39.0.3 but not in Google Chrome. The autocomplete attribute on that field is set to off which theoretically should disable auto complete. But it auto completes anyways. I only started having this issue recently. I assume it's something that cannot be addressed on your end, but perhaps FireFox's end? According to one of their articles:

if a site sets autocomplete="off" for username and password input fields, then the browser will still offer to remember this login, and if the user agrees, the browser will autofill those fields the next time the user visits this page.

- Source

I personally set my login to "remember my password" which is common among users. So based on the bold print from the article, I take it FireFox is doing this on purpose? If so isn't this bad practice considering that the form is set to not auto complete and has extra verification fields making the remembrance counter productive. I'm not in any way docking on ES, I'm thinking it's FireFox's fault. Insights on this are appreciated.