How to edit parameters sent through a form on the Firebug console?

Solution 1:

There is no such option in Firebug, but the Firefox built-in DevTools allow you to edit the data of a previous request and send it again.

*Edit and Resend* option in Firefox DevTools

To get there, first select the Network panel, then in there a request. When you click on the Edit and Resend button, you'll be able to edit everything, the request method, the URL, the query string, the headers and the body.

Editing network request data in Firefox DevTools

After a click on Send the request is sent to the server.