This post is a continuation of  Adding an icon to our Firefox extension post. We are going to be using what we did on that post as a base for this one.

Introduction

The Firefox preferences system provides and easy way of storing small amounts of data for Firefox extensions. There are more advanced systems to store data for extensions but since what we are going to store is actually a user preference we are going to save it there. There are three data types that can be used for preferences: boolean, int and char.

This post is a continuation of Firefox extensions development post. We are going to be using what we did on that post as a base for this one.

Adding the icon

We are going to modify our tntfixer.xul file. This is the initial state of our file:

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<overlay id="tntfixer"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
    <statusbar id="status-bar">
        <statusbarpanel id="tntFixerPanel">
            <label>tntfixer</label>
        </statusbarpanel>
    </statusbar>
</overlay>

For strange reasons I have been needing to use Test and Target in my current job. Test and Target is a tool that allows to easily perform content testing for  websites. The thing is that it’s interface has some issues that make working with it a little dangerous. Because of  that I decided to create a Firefox extension that will decrease the dangers of the interface. I will try to explain through a series of posts the procedure I will follow to create this extension.