To illustrate how to use the WebExtensions APIs, we maintain a repository of example extensions at https://github.com/mdn/webextensions-exampleshttps://github.com/mdn/webextensions-examples. This article describes how to run these examples and lists the examples along with the WebExtensions APIs they demonstrate.

These examples work in Firefox Nightly: most work in earlier versions of Firefox, but check the strict_min_version key in the extension’s manifest.json to make sure.

Some examples work only on specific domains or pages. Each example’s readme file provides details of any restrictions. None of the examples work in private browsing windows by default; see Extensions in Private Browsing for details.

To try these examples, clone the repository, then install and run the extension using one of these options:

• Use the Load Temporary Add-on feature and open the extension from its source folder.

• Install web-ext, open the extension’s source folder at the command line, and use web-ext run.

The extension stays loaded until you restart Firefox.

Don’t submit these extension examples to addons.mozilla.org (AMO); you don’t have to sign the examples to run them.

If you want to contribute to the repository, send us a pull request.