Chrome users who rely on extensions like UBlock Origin, which run on old version of manifesto 2 and it is is no longer supported, he can breathe a sigh of relief, at least for a longer period of time. Google has introduced a temporary developer signal that allows users to continue using these extensions until the release of Chrome 139 in June 2025. This provides a much-needed reprieve as users adjust to the transition to Manifest V3.

Manifesto V2 is the older version of the Chrome Extensions platform. Extensions using this version have a continuous background page, consuming resources even when not actively used, and can execute remotely hosted code, posing security risks.

Manifesto V3 is the newest version of the Chrome Extensions platform. It brings several updates, such as using Service Workers instead of background pages, which run only when needed to save resources. Extensions must now have all JavaScript bundled, making them more secure. Also, the new Declarative Net Request API improves performance and privacy by replacing the older and slower webRequest API.

Google is discontinuing Manifest V2 in favor of Manifest V3 for better performance, security and privacy reasons.

The company already allows enterprises to run Manifest V2 extensions for a year using a policy called “ExtensionManifestV2Availability“.

A reprieve: Chrome users can still use Manifest V2 extensions

Google is now the introduction a flag called “Allow old manifest versions for extensions”, which allows developers to maintain their Manifest V2 extensions until June 2025.

This flag allows users to upload old (unsupported) manifest versions as unpacked extensions. Here is the description of the flag:

“Allows extensions with old (unsupported) manifest versions to be loaded as unpacked extensions. This should only be used for maintaining legacy extensions and will be removed in the future. – Mac, Windows, Linux, ChromeOS, Lacrosse.”

Users can continue to use their preferred Manifest V2 extensions by manually enabling this flag. However, this is a temporary solution. Once the policy supporting this flagging is removed, the flagging will no longer work and users will have to switch to Manifest V3 extensions.

The temporary flag provides a reprieve for users and developers, giving them time to adjust to the new extension system. Users are encouraged to start exploring Manifest V3 alternatives in the Chrome Web Store sooner rather than later.

Apart from this, Google is trying to improve Chrome Detecting tablet mode on Windows and Microsoft is trying steer users away from the Chrome Web Store. Additionally, Chrome can clean up tab bar clutter with the new feature.

Venkat, an experienced technology writer from India, specializes in uncovering new web browser features and technology trends. His work bridges the gap between technology and its users, making the digital world more accessible.