Firefox will automatically fill out forms with information you have entered in forms before. This should be enabled by default. If it isn't, you can enable it yourself: * Type "about:config" in the Firefox location bar, and press Enter or Go * Search for "formfill" * Tap on the "browser.formfill.enable" preference, then press the toggle switch to change it from "false" to "true" Note that autofill will not always work with all forms.