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To help illustrate how to develop WebExtensions, we maintain a repository of simple example WebExtensions at https://github.com/mdn/webextensions-examples. This article describes the extensions in that repository.
These examples work in Firefox Nightly: some work in earlier versions of Firefox, but check the strict_min_version key in the add-on's manifest.json to make sure.
A recommended way to install these add-ons is to use about:debugging, which was added in Firefox 45, these will load the add-on straight from the directory so no zip or sign step is needed.
If you want to contribute to the repository, send us a pull request!
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