Cursor is not draggable in text input boxes

In Firefox for Android, clicking in a text block on a website doesn't show the blue "click to drag" arrow on the cursor common to Android input fields. This is particularly noticeable on Google, where there's a single-line input box and if there's more than about 3 words there's no way to scroll to the right to add more. Am I just missing something? This happens on my Droid Bionic and Nexus 7, for the latest versions of Firefox and Firefox Beta.