Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+WebExtensions API Development
+=============================
+
+This documentation covers the implementation of WebExtensions inside Firefox.
+Documentation about existing WebExtension APIs and how to use them
+to develop WebExtensions is available
+`on MDN <https://developer.mozilla.org/en-US/Add-ons/WebExtensions>`_.
+
+To use this documentation, you should already be familiar with
+WebExtensions, including
+`the anatomy of a WebExtension <https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Anatomy_of_a_WebExtension>`_
+and `permissions <https://developer.mozilla.org/en-US/Add-ons/WebExtensions/manifest.json/permissions>`_.
+You should also be familiar with concepts from
+`Firefox development <https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide>`_
+including `e10s <https://developer.mozilla.org/en-US/Firefox/Multiprocess_Firefox>`_
+in particular.
+
+.. toctree::
+   :caption: WebExtension API Developers Guide
+   :maxdepth: 2
+
+   background
+   basics
+   schema
+   functions
+   events
+   manifest
+   lifecycle
+   incognito
+   other
+   reference
+