Sebov Autofill od Sebo

Sebov Autofill is a lightweight Firefox extension that lets you save form inputs on any website and autofill them later with one click or a keyboard shortcut.

Features:

Save all visible form fields on the current page.
Autofill saved data on the same site.
Save multiple profiles per website and switch between them.
Export saved form data as a JSON file and import it on any device.
Works on any website.
Permissions:

storage - to save and retrieve form data.
tabs and activeTab - to interact with the current page.
<all_urls> - to work on any site you choose.
Note: The extension does not store or sync your data online. All form data is saved locally in your browser