Do you mean it is your webpage, and you do not want users to be able to fill the login automatically? Browsers no longer allow sites to easily bypass password managers using the '''autocomplete''' attribute, as explained here: [https://developer.mozilla.org/docs/Web/Security/Securing_your_site/Turning_off_form_autocompletion#The_autocomplete_attribute_and_login_fields https://developer.mozilla.org/docs/Web/Security/Securing_your_site/Turning_off_form_autocompletion-The_autocomplete_attribute_and_login_fields]. You may want to search around on the web for other ideas.

I have tried this already we were able to block the password manager on IE and Chrome with these codes " @readonly = "readonly", onfocus = "$(this).removeAttr('readonly');" but it failed on Firefox

Interesting. But please check developer-oriented sites to pursue this question. E.g., [[Where to go for developer support]].