Windows 11 is getting better at a small task that happens throughout the working day: sending a link to a browser that is already open. Firefox is now testing support for Microsoft's accelerated app launch mechanism, according to Windows Latest's November 10 report. Edge already supports the approach on eligible Windows configurations, but Mozilla's implementation remains experimental.

The practical benefit is less work between clicking a link in another application and having your existing browser receive it. This is not a new page-loading engine, and it does not make an internet connection faster. It targets the handoff before navigation begins.

Why opening an already-running browser still creates work

When an external application opens a link in Firefox, Windows can start another Firefox process even though the browser is already running. That temporary process locates the existing instance, forwards the request, and exits. Launching Firefox through the Start menu or taskbar can involve the same relay.

That does not mean Windows opens a second complete browsing session every time. The extra process is acting as a messenger. Nevertheless, starting it adds work that becomes unnecessary if Windows can contact the correct running instance directly.

Microsoft calls its alternative accelerated warm launches. A participating application registers its running window with Windows, allowing supported launch requests to reach that window without creating the temporary intermediary. The distinction between a warm launch and a cold launch is central: there must already be an application instance available to receive the request.

What Firefox is testing

Windows Latest reports that Mozilla's work-in-progress patch uses Microsoft's accelerated app launch API. The reported implementation is behind widget.windows.accelerated_launch.enabled, disabled by default and managed through Mozilla's Nimbus experimentation system.

Do not treat that preference name as a recommendation to change settings on a production machine. The report describes unfinished development, not a generally available Firefox feature or a confirmed stable-release date. A Windows update alone does not establish that Firefox has enabled support.

There are also behavior questions to resolve. In particular, the report identifies routing launches when multiple Firefox profiles are open as outstanding work. For people who separate personal browsing from corporate applications, choosing the correct profile matters more than shaving time off the handoff.

The API is a Microsoft Limited Access Feature, requiring developer authorization. According to the report, Mozilla's existing unlock code for taskbar pinning also unlocks this capability. That is an implementation detail for browser developers, not a code that end users need to obtain.

Read the performance numbers carefully

The headline measurement is promising but narrow. Windows Latest cites a developer's quick local-build test in which delivering the request took about 3 milliseconds rather than 70 milliseconds. That measures the launch handoff, not how long a website takes to download, render, authenticate, or become interactive.

Those figures should not be interpreted as a general Firefox benchmark. They describe an early test, and the source does not establish that all users, hardware configurations, or launch paths will produce the same result.

For Edge, the report cites Microsoft's figures of approximately 15% faster launches for most users and up to 33% under heavy multitasking. Those claims concern a different implementation and should not be substituted for Firefox performance expectations. Windows Latest also describes a subjective improvement in its own low-memory virtual-machine test, rather than a comprehensive cross-device benchmark.

The useful takeaway is that removing avoidable process startup can improve responsiveness. It is not evidence that every browser operation becomes faster.

What is available in Edge

According to Windows Latest, Edge 150 and later supports the feature on Windows 11 25H2, 26H1, and 26H2 with the October 2026 non-security update or later. The publication says the change is also coming through the November 10 security update for eligible systems.

Eligibility remains important: this is not a promise covering every Windows installation. Administrators should confirm deployed Windows and Edge versions and follow their normal update validation process rather than assume an update has already reached every endpoint.

The feature also does not accelerate the first browser launch after a restart if no browser instance is running. Background-running features such as Edge Startup Boost can make warm launches more common, but that is separate from eliminating the relay process. There is no need to change background-running policies solely to chase this improvement.

A practical checklist for IT teams

For everyday users, the sensible response is to keep Windows and the browser updated through supported channels and wait for Mozilla to announce availability. There is no reported need for registry modifications or third-party optimization utilities.

For a managed pilot, focus on correctness as well as speed:

- Open links from the email and collaboration applications staff actually use.
- Test taskbar and Start menu launches with the browser both open and fully closed.
- Confirm that default-browser selection and expected profile routing remain correct.
- Compare equivalent workloads rather than mixing cold starts with warm launches.
- Keep existing deployment rings and rollback procedures in place.

Microsoft's API does not cover every launch source or Windows version, the report notes, so applications still need their traditional single-instance fallback. An occasional temporary process therefore would not, by itself, prove the feature is broken.

Other browsers are possibilities, not commitments

Windows Latest says Chrome, Brave, and Vivaldi have not announced support. Other single-instance applications could adopt the mechanism too, but that potential should not be presented as a shipping roadmap.

For now, the news is a targeted Windows efficiency improvement with Firefox integration under development. Expect a potentially smoother return to an already-open browser, not a replacement for investigating slow websites, extensions, or network problems.

Source: Windows Latest reporting by Abhijith M B, published November 10, 2026.