How to View or Edit the Source Code of a Firefox Addon

Here's how to edit or view source code of a Firefox addon/extension by downloading XPI file or locating addon folder on local drive.

Your first extension - Mozilla

FireBug and Firepath Addon for Firefox Automation Testing with Open Source Tools

How to Use Firefox Addons

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Firefox Add-ons For Application Security Testing

Extension source viewer – Get this Extension for 🦊 Firefox (en-US)

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9 Open Source Add-Ons to Improve Your Firefox Experience

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Fire Source Viewer – Get this Extension for 🦊 Firefox (en-US)