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.