Webextension update issues
If you have problems updating the extension, remove it completely and make fresh install.
Formlet is Firefox extension for saving form data to bookmarklets.
It was inspired by Form Saver, which unfortunately does not work since Firefox 4.x. While Formlet is completly new and independent extension, the basic idea has been preserved - forms data is saved as autofilling bookmarklets.
Why another form filler?
At Mozilla Addons you can find plenty of form fillers (eg, Autofill Forms, AutoFormer etc). But personally I liked the simplicity of Form Saver, which was saving form data to a simple bookmark. It is sufficient for form testing and does not require complicated configuration. What's more - bookmarklets created in this way will work also in other browsers!
How it works