Microsoft announced on August 7, 2026 that its Edge browser will start moving everyday users away from older browser extensions starting in August 2026, with the goal of finishing the switch by the end of the year. The company shared the plan in a post on the Microsoft Edge Insider blog. Microsoft Edge Insider Blog

Browser extensions are small add-on programs that give your browser extra features, like blocking ads or managing passwords. Think of them like apps on your phone, but for your browser. Extensions are built using a set of rules, called a "manifest," that tells the browser what the extension is allowed to do. Microsoft is moving from an older set of rules, called Version 2, to a newer one called Version 3.

The change will first appear in Edge's testing versions, which are preview tracks that come out before the main release. It will then gradually reach the stable version of Edge that most people use. Microsoft will slowly turn off the older Version 2 extensions by default over the coming months. Users will get a notice before their old extensions are switched off and will be pointed toward newer replacements where available. The Verge

Computers managed by an organization's IT department will not be affected during this phase. The older extensions will be phased out for those enterprise users in early 2027.

This transition has been years in the making. Microsoft first announced in October 2020 that Edge would support the new Version 3 rules. The Edge extension store stopped accepting new Version 2 extensions from July 11, 2022. Microsoft Edge Dev Blog

For people who make extensions, the message is simple: any extension still using the older rules needs to be updated, and the time to do so is running short. Microsoft's plan to notify users and recommend replacements suggests the company will try to guide people toward new versions rather than just switching things off. How well that works depends on whether updated versions actually exist for every extension someone uses.

The change has been controversial across the broader browser world. The main reason is how it affects ad blockers and privacy extensions. Under the old rules, these extensions could watch and block web traffic in real time. The new rules replace that with a system where extensions provide a list of rules in advance, and the browser enforces them. This is faster and more secure, but it limits what ad blockers can do. Extensions that depended on inspecting traffic on the fly have had to be rebuilt around fixed rule lists.

Microsoft's decision to leave work computers out of the initial rollout makes practical sense. Businesses often rely on custom or specialized extensions, and a sudden cutoff could break important workflows with no easy fix. Giving those organizations until early 2027 buys time to review what they use and find replacements.

The unanswered question is how many older extensions still have no updated replacement. Microsoft's plan assumes that new versions will be ready when needed, but the company has not said how big the gap is. For anyone using a less popular extension that has been abandoned by its developer, the result may be that it simply stops working.