For those that don't want to see this notification / banner, add the following rule to your adblocker:

##.new-contributor-indicator

This should block the indicator from showing up on the answer field, and on the user information under the question.

For those that don't want to see this notification / banner, add the following rule to your adblocker:

##.new-contributor-indicator

Or using a userstyles plugin:

.new-contributor-indicator{
    display:none;
}

Or a userscript:

$('<style type="text/css">.new-contributor-indicator {display: none;}</style>')
    .appendTo($('head'));

This should block the indicator from showing up on the answer field, and on the user information under the question.