Background
S&S Activewear, a major wholesale distributor of blank apparel, sued Promo Hunt over its browser extension that displays price comparison popup windows over e-commerce websites. When users with the Promo Hunt extension visit S&S’s website, the extension overlays information comparing S&S’s prices against competitors — a feature S&S viewed as parasitic interference with its customer relationships.
S&S brought eleven claims, including trespass to chattels, violations of the Computer Fraud and Abuse Act (CFAA), trade secret misappropriation, and Lanham Act claims. Promo Hunt moved to dismiss the trespass to chattels claim, arguing that once website content reaches a user’s device, the website operator no longer has the kind of possession or control required for a trespass claim.
The Court’s Holding
Judge Durkin dismissed the trespass to chattels claim with prejudice. The court held that S&S lacks possession or control over how its website appears on consumers’ computers. Once web content is transmitted to a user’s browser, the user — not the website operator — controls the display environment. A browser extension that modifies how a user views a website operates on the user’s device and does not constitute a trespass to the website operator’s property.
The remaining ten claims — including CFAA, trade secret, and Lanham Act claims — survived the motion and remain pending.
Key Takeaways
- Website operators don’t control the user’s browser: The ruling continues a line of cases holding that once content is delivered to a user’s device, the website operator cannot dictate how it is displayed. Browser extensions that modify the user’s viewing experience — even in ways the website operator dislikes — do not constitute a trespass to the operator’s property.
- “Website framing” theory keeps losing: As copyright professor Eric Goldman noted in his commentary on this decision, plaintiffs continue to bring — and lose — cases based on the theory that overlaying or “framing” a website constitutes actionable interference. The legal theory has been rejected consistently since the late 1990s.
- Other claims survive: The dismissal of the trespass claim does not end the case. The CFAA, trade secret, and Lanham Act claims provide alternative theories that may prove more durable, particularly if Promo Hunt’s extension accesses data beyond what is publicly displayed.
Why It Matters
Browser extensions that modify website displays — from ad blockers to price comparison tools to coupon finders — are ubiquitous. This ruling reinforces the principle that website operators cannot use trespass law to control what users do with content once it reaches their devices. For the growing ecosystem of browser extension developers, the decision provides continued legal breathing room. For e-commerce companies concerned about competitive overlays, the message is clear: if you want to challenge a browser extension’s behavior, trespass to chattels is not the right tool. Focus instead on whether the extension accesses protected systems, misappropriates trade secrets, or creates consumer confusion actionable under the Lanham Act.
Surfaced via Eric Goldman’s Technology & Marketing Law Blog.