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.

View Source :: Add-ons for Firefox

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Manage your extensions using the extensions button in the toolbar

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How to view page source code in Firefox in an external editor [Tip]

How to save firefox addons for offline installation - Super User

Various extensions inexplicably not, or no longer, installable to Firefox on FreeBSD through the GUI to addons.mozilla.org (AMO) · Issue #468 · mozilla/addons · GitHub

DOM Inspector :: Add-ons for Firefox

Temporary installation in Firefox

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