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Edit Source 220.127.116.11-signed.1-signed
About this Add-on
In addition, you can open a source editor for about:blank and write fresh, new HTML, rendering it in a Firefox tab to see what it looks like as you go.
The code for this extension lives on Github: https://github.com/a2sheppy/Edit-Source
This add-on is not compatible with your version of Firefox because of the following: