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Could Firefox handle Form Pre-Population with Saved Username/Password Better?

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I just saw firefox pre-populate the Last Name and Password field of my Create Account form with a saved username(email) and password, respectively. It's very strange to see the Last Name field of a Create Account form to be pre-populated with an Email address!

Here are the details...

I am using Firefox 54.0 (64-bit) on MacOS Sierra.

I opened this web page https://account.hallmark.com/#/crsignup I am a developer for this website.

The problem I found is, the Last Name (lastName) field was pre-populated with an email address by Firefox. (I checked all of the HTTP requests and the e-mail address was not in any of them.)

The Password field was pre-populated as well.

I think what is happening is, Firefox detected the Password field (either by the attribute name=password or by type="password"), then it found a saved password that I had used to sign in to account.hallmark.com earlier. Finally, it pre-populated the password field and the input field that immediately preceeded it (which happens to be a Last Name field) with the saved username and password.

This is weird behavior that will confuse our QA team and users.

I don't know if there is a better way for Firefox to pre-populate forms (perhaps only prepopulate <input> elements with type="text" and name="username" or something like that), but the current behavior is confusing.

I just saw firefox pre-populate the Last Name and Password field of my Create Account form with a saved username(email) and password, respectively. It's very strange to see the Last Name field of a Create Account form to be pre-populated with an Email address! Here are the details... I am using Firefox 54.0 (64-bit) on MacOS Sierra. I opened this web page https://account.hallmark.com/#/crsignup I am a developer for this website. The problem I found is, the Last Name (lastName) field was pre-populated with an email address by Firefox. (I checked all of the HTTP requests and the e-mail address was not in any of them.) The Password field was pre-populated as well. I think what is happening is, Firefox detected the Password field (either by the attribute name=password or by type="password"), then it found a saved password that I had used to sign in to account.hallmark.com earlier. Finally, it pre-populated the password field and the input field that immediately preceeded it (which happens to be a Last Name field) with the saved username and password. This is weird behavior that will confuse our QA team and users. I don't know if there is a better way for Firefox to pre-populate forms (perhaps only prepopulate <input> elements with type="text" and name="username" or something like that), but the current behavior is confusing.