Following the launch of Manifest V3 earlier this year, Google has now laid out a timeline for when Google Chrome extensions using the older version of its extension platform will no longer be supported.     First announced back in October of 2018, Manifest V3 is a set of changes to the Chromium open-source browser engine and the WebExtensions API that updates the way in which browser extensions work with Chrome, Brave, Opera, Vivaldi, Edge and other Chromium-based browsers.