No, there currently is no way to manually enter a password into chrome The ability to save a password can be disabled by the website (often done by banks) Is the site your having trouble with a bank? I use a password manager to manage my saved passwords, it supports multiple gmail accounts and you can choose which one to fill. Saving login credentials to chrome means they are stored in your google account to which you are logged into the browser But sometimes, only the password get saved and username remains blank.
Fortunately, there is a way to disable this chrome feature. You can stop google chrome from saving passwords on your computer or mobile device by disabling ask to save passwords option in chrome. How to make google chrome stop asking you to save the passwords Make it stop just for an individual site or for all websites.
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