A coalition of browser makers called the Browser Choice Alliance today issued a statement accusing Microsoft of continuing to steer Windows users toward its Edge browser through interface design, tying its response to a study Mozilla published in May 2026 and to an open letter the alliance sent Microsoft on June 3, 2026.

The statement, sent by Amy Stevens on behalf of the Browser Choice Alliance, praised the research team behind Mozilla's report while making clear the alliance itself had no role in producing it. "We applaud the research team for once again shining a spotlight on practices that distort competition and limit user choice," the statement reads. It goes on to describe the findings as showing "how Microsoft continues to use manipulative tactics to push users toward Edge, limiting users' ability to choose and run their chosen browser," and characterizes the pattern as operating "at a global scale" across Windows 11 devices.

The Mozilla-backed report the alliance is responding to, titled Over The Edge 2.0: Do Microsoft's Design Tactics Still Compromise Free Browser Choice?, was covered by PPC Land the same day. Researchers Dr. Harry Brignull and Cennydd Bowles tested Windows 10 and Windows 11 across four regions and found that switching a browser away from Edge, and keeping it switched, still runs into design obstacles almost everywhere except inside the European Economic Area, where Digital Markets Act obligations appear to have removed several of the patterns documented elsewhere.

What the alliance is asking for

Rather than simply commenting on the Mozilla research, the Browser Choice Alliance used its statement to draw a straight line back to its own earlier demand. According to the statement, the alliance "recently issued an open letter to Microsoft, challenging the company to cease the harmful patterns outlined in the report," and it now calls on Microsoft to implement seven specific changes "immediately and on a worldwide basis."

Those seven changes, listed identically in both the July 14 statement and the June 3 open letter, are:

  • Preinstallation competition: allowing browser suppliers to compete for preinstallation and default deals with Windows PC manufacturers, rather than facing exclusive or preferential arrangements favoring Edge.
  • Dark pattern removal: ending interface tactics targeted at users who are trying to download and effectively use other browsers, including when a rival is set as the system-level default.
  • One-click switching: restoring the ability to change default browsers with what the alliance calls a "single click," covering all relevant file types and applications, including PDFs.
  • Link handling: opening all web links inside whichever system-level browser a user has selected, rather than redirecting them elsewhere.
  • Banner removal: eliminating what the statement calls "manipulative Microsoft-exclusive banners pushing Edge in Windows," specifically including banners shown while a user is actively searching for other browsers.
  • Update behavior: stopping the use of operating system updates as a mechanism to push users back toward Edge after they have already switched away from it.
  • S mode changes: removing what the alliance describes as "restrictive configurations of existing S mode devices" that currently block the use of third-party browsers on those machines.

The open letter itself, published on the Browser Choice Alliance's website under the heading "Dear Microsoft, Enough is Enough" and addressed directly to chief executive Satya Nadella, frames the underlying complaint in broader terms than any single design pattern. "Microsoft leverages its immensely powerful position as the supplier of the ubiquitous Windows PC operating system, as well as many productivity and other must-have apps, to push users towards its first-party browser, Edge, through tactics that restrict, distort, and subvert user choice," the letter states.

Seven practices named in the open letter

Where the July 14 statement lists seven requested changes, the June 3 letter itemizes seven specific practices the alliance says Microsoft currently deploys. The letter describes these as: economically coercive "all-or-nothing" rebates that foreclose rival browsers from preinstallation opportunities on Windows devices; preventing the uninstallation of Edge; showing intrusive and confusing messages to users in Microsoft's exclusive promotional areas when they attempt to download competing browsers; using system updates to push users back to Edge or deploying interface design the letter calls manipulative to confuse users into switching their default browser back; ignoring a user's chosen default browser for links opened inside Teams and Outlook; hardwiring Edge to key access points on Windows, including Windows Search and Widgets; and blocking rivals' one-click switch functionality for changing the default browser.

Each of the seven practices maps closely to one of the seven requested fixes, structured as a direct list of grievances followed by a matching list of remedies. The letter frames the stakes in terms that extend beyond simple product preference. "PCs are a major access point to the web, playing a critical role in work, productivity, and other high-value online activities," the letter states, adding that "the importance of PCs is only increasing in the age of generative AI, with PCs particularly well-suited for key AI use cases such as coding, deep research, and more."

The letter also acknowledges that Microsoft's approach is not uniform. "Microsoft's practices vary over time and between jurisdictions," it states. "They may be inconsistently applied or appear intermittently, sometimes differing from one user to another. Nevertheless, Microsoft's basic approach remains constant: leveraging its dominant Windows OS and productivity software to favor its own browser to the exclusion of others."

An organization distinct from Mozilla

One detail runs through both documents without much elaboration: Mozilla is not a member of the Browser Choice Alliance. The July 14 statement makes the distinction explicit, describing the alliance's praise for "Mozilla (which is not a BCA member) and the research team." The alliance's own materials describe itself as "a global coalition of innovative developers" united around what the open letter calls "genuine competition and users' freedom of choice." Neither document names which specific browser makers belong to the coalition, nor does either specify a membership count, a founding date, or a legal structure for the organization.

That gap matters for how the statement should be read. The Mozilla-backed Over The Edge 2.0 report is an independent research product commissioned by Mozilla and authored by two researchers, Brignull and Bowles, whose findings PPC Land's original coverage traced screen by screen across eight virtual machines and four countries. The Browser Choice Alliance statement is a separate document: an advocacy response from a coalition with its own institutional interest in how Windows treats competing browsers, issued in reaction to research it did not commission and did not write. The alliance's endorsement of the findings carries the weight of an interested party agreeing with an independent study, not the weight of the study's authorship.

Timing and the open letter's place in the sequence

The sequence of events places the Mozilla report at the center, with the alliance's communications bracketing it on either side. Mozilla's Over The Edge 2.0 report was published in May 2026, following field testing that Brignull and Bowles conducted between late March and mid-May of that year. The Browser Choice Alliance's open letter to Nadella followed on June 3, 2026, roughly three to four weeks after the Mozilla report appeared, and it referenced the same category of Windows design practices the report would later formalize into a research taxonomy.

The July 14 statement, sent today, arrived just over six weeks after the open letter, with no indication in either document that Microsoft had responded publicly to the alliance's June demands in the intervening period. Because the statement was addressed directly to a PPC Land reporter covering Mozilla's research, its function differs from a standard press release aimed at broad media distribution; it reads instead as a direct follow-up intended to keep the alliance's earlier demands connected to fresh, independent research findings covering the same underlying subject.

Why this matters for the marketing community

For anyone buying, measuring, or optimizing digital advertising, a browser default is not a cosmetic setting. PPC Land's coverage of the underlying Mozilla research already laid out why: a browser determines which cookie rules apply to a session, which tracking-prevention defaults are switched on, and, increasingly, which AI assistant sits between a click and the page it lands on. If Windows resets that default at the scale the Mozilla-backed report describes, then attribution models built on the assumption that a user's chosen browser stays chosen deserve scrutiny, and the Browser Choice Alliance's public pressure campaign adds an organized, ongoing voice pushing for exactly the kind of change that would make that assumption reliable again.

The regulatory backdrop gives the alliance's seven demands a testable quality that a purely rhetorical complaint would lack. PPC Land's reporting on the Digital Markets Act's six gatekeepers has tracked how Microsoft's 2023 designation under the regulation came with specific compliance obligations, and the Mozilla-backed research found that several of the harmful patterns documented in the United States, United Kingdom, and India were simply absent when the same user journeys were tested with Windows set to a German, EEA-representative region. That divergence gives the alliance's global demand a built-in comparison: whatever Microsoft has already changed inside the EEA is available as a template for what compliance elsewhere could look like, without requiring Microsoft to invent a new approach from nothing.

There is also a measurement angle that connects directly to problems advertisers already track. PPC Land's coverage of Safari's tracking protections has documented how browser-level privacy defaults can silently strip identifiers such as GCLID from a meaningful share of ad clicks, degrading attribution data that automated bidding systems depend on. The dynamic the Browser Choice Alliance describes is different in mechanism, an operating system vendor allegedly steering users toward its own browser through interface design rather than a browser vendor tightening privacy defaults, but the practical effect for measurement teams points the same direction: less certainty about which browser environment produced a given click, and therefore less confidence in what any single attribution figure actually represents.

Whether the alliance's public pressure changes Microsoft's approach on a global rather than region-by-region basis remains an open question. Neither the July 14 statement nor the June 3 letter includes a Microsoft response, a specific deadline, or an enforcement mechanism beyond continued public advocacy. What the two documents do establish is a formal, dated record of an organized industry complaint that predates and now directly references independent research reaching broadly similar conclusions, a combination that gives regulators watching the space, including those enforcing the Digital Markets Act, two independent threads of evidence pointing at the same underlying set of Windows design choices.

Timeline

  • May 2026 - Mozilla publishes Over The Edge 2.0: Do Microsoft's Design Tactics Still Compromise Free Browser Choice?, authored by Dr. Harry Brignull and Cennydd Bowles.
  • June 3, 2026 - The Browser Choice Alliance publishes an open letter addressed to Microsoft chief executive Satya Nadella, listing seven browser-steering practices and seven corresponding requested changes.
  • July 14, 2026 - The Browser Choice Alliance sends a statement responding to Mozilla's report, reaffirming its June 3 demands and crediting Mozilla's research team while noting Mozilla is not a member of the alliance.

Summary

Who: The Browser Choice Alliance, a coalition describing itself as a global group of browser developers, issued the statement through Amy Stevens. The statement responds to research authored by Dr. Harry Brignull and Cennydd Bowles and commissioned by Mozilla, and references the alliance's own June 3 open letter addressed to Microsoft chief executive Satya Nadella.

What: The alliance credited Mozilla's Over The Edge 2.0 report with documenting how Microsoft steers Windows users toward Edge, while reiterating seven specific changes it wants Microsoft to make, covering preinstallation competition, dark pattern removal, one-click browser switching, link handling, promotional banners, operating system updates, and S mode restrictions.

When: The Browser Choice Alliance sent its statement on July 14, 2026, the same day the underlying Mozilla-backed research received coverage. The alliance's open letter to Microsoft was published on June 3, 2026, roughly a month after Mozilla's May 2026 report.

Where: The dispute concerns Windows 10 and Windows 11 devices globally, with the alliance's demands framed as applying worldwide rather than only in jurisdictions such as the European Economic Area, where the Digital Markets Act already imposes browser-choice obligations on Microsoft.

Why: The matter affects advertisers, publishers, and marketers because browser defaults determine which tracking-prevention rules and cookie policies apply to a session, and because an organized coalition has now placed a dated, public record of demands alongside independent research reaching related conclusions, giving regulators two separate bodies of evidence to draw on.