If you use uBlock Origin on Microsoft Edge, it’s time to start looking at alternatives. Microsoft has shared a timeline for the transition away from Manifest Version 2 (MV2) extensions. That transition will end support for uBlock Origin on Edge, alongside a small group of other extensions.
Microsoft aims to fully transition consumers away from MV2 extensions by the end of 2026. Some users will start seeing notices about the change this month (August 2026). Microsoft will then gradually turn off MV2 extensions by default over the coming months.
Enterprise users will be transitioned away from MV2 extensions in 2027.
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It’s not a surprise that MV2 support is being discontinued. In fact, the surprise is that we finally have a confirmed date for the end of support. Microsoft has had MV2 support on the chopping block for ages but had not committed to a firm cutoff date.
MV2 and its replacement Manifest Version 3 (MV3) are extension platforms that developers can build upon. There are technical differences between the two, the most notable is that MV3 limits the WebRequest API, which allows ad blockers to dynamically intercept and block network requests before they load.
Since Edge is built on Chromium, which is Google’s open-source engine, Google pushing MV3 affects Microsoft Edge.
This shift to MV3 is not arbitrary; there are practical benefits to the switch. MV3 is more secure and provides better performance than MV2. Some believe the transition to MV3 is being pushed to give Google more control over ads on the web, though that is up for debate.
The end of MV2 support will affect several extensions, but the biggest one is uBlock Origin. I suspect few would care about the end of MV2 support if uBlock Origin were unaffected.
Microsoft states that 95% of the top MV2 extensions in the Edge Add-ons store have been moved to MV3. There are only 58 MV2-based extensions in the Edge Add-on Store at all. Only three of those MV2-based extensions do not have MV3-based equivalents available.
There is a version of uBlock Origin that works with MV3, though it’s uBlock Origin Lite. That extension lacks some of the granular controls of the full version. It also works differently in the background, hiding most content rather than preventing items from loading.
Many people could replace uBlock Origin with uBlock Origin Lite without issue, but power users could struggle with the change. Some people plan to switch browsers before changing ad blockers.
Mozilla Firefox still supports the tech needed for uBlock Origin to function. Brave committed to keeping MV2 extensions working as well.
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