This add-on is for edump which is provided for web developers. Please look at this website. You can understand easily.
https://www.edump.net/

edump provide the web debugging and logging tools for the developer. Hence this add-in can show the console of edump on your developer window. When you utilize this add-on, you can confirm various valuable from the console of edump with the target web page. It's so efficient to debug for the page.
You can use PHP, Python and etc. I hope you can increase your development environment.

This version is confirmed to install to the latest version of FireFox.