Morrow Browser Works
Morrow Browser Works: Response to the CAPA Discussion Draft
MBW-VEIL-2026-01 · Browser implementation, certification access and extension policy.
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A useful technical direction
Morrow Browser Works supports a smaller advertising interface, isolated execution and enforceable resource ceilings. Browser vendors currently absorb the support costs of arbitrary page scripts without a consistent authority to constrain the services supplying them. VEIL identifies a real infrastructure problem and offers a credible point for technical enforcement.
Our support depends on the ability to implement the interface independently. A certification profile should describe testable properties and accept equivalent evidence. Access to a shared advertising market should remain practical for a browser vendor with a small engineering team.
Certification and implementation diversity
Recurring audit fees, specialized settlement infrastructure and mandatory renewal can create substantial fixed costs. A requirement that appears modest relative to a major platform’s budget can determine whether a smaller implementation is viable. The draft should publish an affordable testing route and prevent commercial participants from controlling access to essential conformance evidence.
An interoperable request format also needs a working migration path. Publishers should be able to serve an independent conforming browser without negotiating a separate commercial relationship with the largest mediator.
User extensions and the integrity boundary
The bypass definition includes changes to suppression decisions. That scope reaches extensions whose purpose is to filter unwanted material. Treating all such intervention as a conformity failure would require users to accept the policy menu offered by the certified implementation or its administrator.
We recommend a protected user-extension boundary, with testing focused on measurement honesty and resource safety. A browser can accurately record that an advertisement was withheld without representing it as viewed. That distinction preserves billing integrity while leaving room for user control.