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=A CrossWeb-Browser based API for Developing Add-onsExtensions in Firefox=The technology for developing add-ons is in transition to [https://developer.mozilla.org/en-US/Add-ons/WebExtensions WebExtensions APIsAPI]is the new technology for developing extensions in Firefox. These APIs are based on Web standards and let you create and maintain one codebase that works across multiple browsers, without having to update it for every Firefox release.