Chrome убивает uBlock Origin Workarounds по мере исчезновения MV2 Flags

If you're still using uBlock Origin on Chrome via registry tweaks or enterprise policies, those bypasses stop working after Chromium 151. Google engineer Devlin Cronin confirmed on the w3C WebExtensions Community Group GitHub repo that the kExtensionManifestV2Disabled flag is now completely removed from the codebase — it's no longer just disabled by default, it's gone.

Cronin explained that maintaining MV2 compatibility alongside MV3 brought “growing technical difficulties and implementation complexities” plus real security bugs specific to MV2. Translation: Chrome's engineering team stopped carrying dead code.

Chromium 150 and 151: The Final MV2 Flags

The deprecation timeline is precise. Chromium 150 lost the ExtensionManifestV2Disabled option. Chromium 151 kills ExtensionManifestV2Unsupported, ExtensionManifestV2Availability, and likely AllowLegacyMV2Extensions. The Windows Registry mod that extended MV2 availability? Gone after 151. Those flags were the last escape hatches.

uBlock Origin developer Raymond Hill (gorhill) noted that Opera sent him an email last year saying they plan to abandon MV2 entirely. Opera's Extensions Team explicitly warned: “Chromium is completely removing support for Manifest Version 2.” Edge already started disabling uBlock Origin back in February 2025.

Brave and Firefox Are the Survivors

Brave is the only major Chromium-based browser that has committed to keeping MV2 support alive — Vivaldi may also hold out. Firefox, meanwhile, supports both MV2 and MV3 natively with no flags required. If you want the full uBlock Origin experience (not the watered-down uBO Lite on MV3), Firefox is the straightforward alternative.

Cronin’s parting jab: “Other browsers can continue supporting these if they so desire.” But Chrome's codebase no longer carries the compilation flags to make that easy. The complexity and technical debt are now someone else's problem.

What this actually enables next: a browser market split where ad-blocking power users cluster on Firefox and Brave, while Chrome users settle for the limited MV3-based uBlock Origin Lite — or learn to live with ads.

Source: Google Chrome is killing all uBlock Origin bypasses, Edge, Opera to follow
Domain: neowin.net