AutoFormer is a Firefox addon to auto fill web forms. Once you fill form on web page manually, further you can right click some form field to call context menu and select "AutoFormer→Save all fields" to save entered data. During the next visit on this web page saved data will be loaded into form. It is supported profiles of data to store some data sets for one web form.
In 0.1 - 0.4.3 addon versions all saved data has been stored in the site cookies. From 0.44 version all stored data are removing from cookies to Firefox DOM Storage (window.localStorage).

Download AutoFormer v0.47 for old Firefox versions (up to Firefox 56)
Write feedback to autoformer.plus@gmail.com