Stop Porn takes a content-based approach to filtering rather than relying on a blocklist of domains. When a page finishes loading, the extension fetches its images, runs them through a locally installed image classification model, and blocks the page if the model flags enough explicit content. Because the model ships with the extension, there is no lookup server and no image upload.
The trade-off is that detection is heuristic. Blocking is triggered only when five or more pornographic images are found, which limits accidental blocks but also lets some pages through. Some sites load placeholder thumbnails first or lazy-load images on scroll, so results can depend on how you interact with the page. Pages may also stay visible for a few seconds before the block takes effect.
Privacy is the headline benefit: image processing happens on the client side and the developer states that no data is sent out of the extension. It is a lightweight, free utility rather than a full parental-control suite, and it works best alongside other safeguards if you need serious filtering.
