Microsoft is ending support for Manifest V2 extensions in Edge, cutting off uBlock Origin and other older ad blockers, mirroring a change Google Chrome made earlier in 2026. Anyone who blocks ads or trackers in Edge should check whether their extension still works before it gets switched off.
What actually happened
According to Microsoft, only 58 extensions on the Edge Add-On Store have 'meaningful usage' and still run on Manifest V2. Of those, just three lack a Manifest V3 version, The Verge reported on 7 August 2026. Microsoft said in a statement: 'Over the next few months, MV2 extensions will be gradually turned off by default. Users will be notified in advance and directed to recommended MV3 versions where available.' The rollout starts in Edge's Canary, Dev, and Beta channels before reaching the Stable channel. Microsoft aims to finish the consumer transition by the end of 2026. Enterprise deprecation follows in early 2027. Managed devices will not be affected during the consumer phase.
How we got here
Google Chrome pushed a similar shift earlier in 2026, phasing out Manifest V2 and pushing users toward Manifest V3, which limits the network-blocking APIs that full ad blockers depend on, per The Verge. Edge, built on Chromium, is following the same platform roadmap. uBlock Origin Lite already exists as an MV3 alternative, though it offers less filtering control than the original. Opera has said it will keep supporting MV2 extensions 'for as long as it's technically reasonable.' Firefox, which uses its own extension engine, still supports full MV2 style ad blockers.
Why this matters for you
For Edge users running uBlock Origin or similar tools, ad blocking could weaken or stop working once MV2 support ends. Switching to uBlock Origin Lite keeps some filtering but with fewer rules and less customization. Users who want full ad and tracker blocking may need to move to Firefox or Opera. For extension developers, MV3 migration is no longer optional on Chromium browsers. For anyone building browser based tools around ads, privacy, or content filtering, including wallet and Web3 extensions, this narrows which platforms allow deep browser level control.
The bigger question
If every major Chromium browser converges on the same extension rules, how much real choice do users have left, and what happens to browser level privacy tools when platform owners control what extensions can technically do?
What to watch
Microsoft's MV2 phase out begins in the Canary, Dev, and Beta channels this month, spreading to Stable over the following months. Microsoft targets the end of 2026 to finish the consumer transition. Enterprise users keep MV2 support until early 2027, when Microsoft deprecates it there too. Watch for in browser notifications pointing to MV3 replacements before your current ad blocker stops working.
