Please modify the attached addon for FireFox. It works on PC. I want you make it work on Android. You don't have to change any function.
My android phone version is 4.1.1, and firefox version is 20.0.1. I would like you to show me how to install the addon, too.
(Function of Addon)
When you access some webpage, addon gets a shorten URL from bitly, and add it as a link in the webpage.
Here is the addon.