# Browser transition to Manifest V3 extension architecture > Live situation record from CLSTR: https://clstr.news/situations/browser-transition-to-manifest-v3-extension-architecture > Updated: 2026-08-12T13:13:11.000Z. Sources: 30. Developments: 2. Microsoft Edge is beginning a phased transition from the Manifest V2 extension architecture to Manifest V3, a move similar to policies implemented by Google Chrome. This transition aims to improve browser security and performance by limiting background processes and tightening extension permissions. The shift significantly impacts ad-blocking extensions that rely on the WebRequest API, such as the standard version of uBlock Origin. While Manifest V3 utilizes the declarativeNetRequest API to improve security, it imposes strict quotas that can reduce the precision of cosmetic filtering and the ability to track rapidly changing ad domains. Consequently, users may need to switch to compatible alternatives like uBlock Origin Lite. In response to these changes, some browsers are offering different levels of support. Mozilla Firefox has confirmed that support for uBlock Origin is not changing, and the Chromium-based Brave browser has stated it will continue to support MV2 extensions. ## Timeline ### 2026-08-12: Browser transition to Manifest V3 impacts uBlock Origin functionality The shift from Manifest V2 to V3 is disabling powerful ad blockers like uBlock Origin on Chrome and Edge, though Firefox and Brave have pledged to maintain support for the extension. 3 sources. https://clstr.news/cluster/browser-transition-to-manifest-v3-impacts-ublock-origin-functionality ### 2026-08-07: Microsoft Edge to phase out Manifest V2 extensions and older ad blockers Microsoft Edge is transitioning to Manifest V3, which will disable older ad-blocking extensions like uBlock Origin by late 2026 for consumers and early 2027 for enterprises. 27 sources. https://clstr.news/cluster/microsoft-edge-to-phase-out-mv2-extensions-ending-support-for-legacy-ad-blockers --- Cite as: Browser transition to Manifest V3 extension architecture. CLSTR, https://clstr.news/situations/browser-transition-to-manifest-v3-extension-architecture