Setting up the development environment
First, we need to set up a file structure for our add-on, so let us begin by creating a new folder on the computer. C:\DDG_ addon in our case is the add-on folder. Now, inside that new folder, create a folder called content.
Here, the code is written in XML. The file consists of general information about the add-on such as its version number, name, description, the version of the Firefox browser it supports, the creator of the add-on, etc. sam[email protected]ample.net is the ID of the extension. It can be your email address.