The W3C Browser Extensions API allows you to create interoperable extensions for browsers that support an API, and includes the packaging format used for those extensions. It specifies common extension interfaces and well-defined browser behavior to make browser extension code more interoperable across browsers. This includes features for; page modification for web site content, UI augmentation for web browsers, network request modification and more. The World Wide Web Consortium develops interoperable technologies that includes specifications, guidelines, software, tools and more.
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