For example, previously the browser would ask a content-blocking extension what to do with a particular web request, and the extension would respond by either greenlighting, blocking or redirecting it. The API introduces significant changes to the rules that extensions have to follow, such as which browser features an extension has access to and can modify. It is now being implemented across Chromium-based browsers, including, of course, Google Chrome itself. Manifest V3 is Chrome’s new extension API, first announced in 2018. On the other hand, it allows content-blocking extensions that were originally built using the less restrictive Manifest V2 to continue working at full tilt.īefore we go any further, let us remind you what Manifest V3 is, and why it has drawn so much backlash from privacy advocates and content-blocking extension developers including AdGuard. On the one hand, by implementing Manifest V3 on its own terms, Mozilla saves developers who are switching to the new platform from having to support two different versions of their extensions (for Google Chrome and Firefox) at the same time. The new version of Firefox, which began rolling out last month, will ensure that users still have access to popular privacy-preserving tools, most notably content-blocking extensions. Mozilla has made good on its promise to implement Google’s new extension platform, Manifest V3, in a way that does not compromise the functionality of ad blockers.

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