Vigil Page Change Monitor is a Firefox extension that watches selected elements on webpages and notifies users when their content changes. It includes point-and-click element selection, scheduled background checks, and side-by-side old and new values for prices, availability, scores, listings, and other visible text.
In the Browser DevTools & extensions space, Vigil Page Change Monitor takes a focused approach. It focuses on checking webpages repeatedly for price, availability, or content changes. Vigil Page Change Monitor is a consumer product aimed at firefox users monitoring changing webpage content. It is available for free. It ships for the web, embeddable surfaces, and Android.
Behind Vigil Page Change Monitor is Zachery, and it first shipped in 2026. Key capabilities include element picker, background monitoring, and scheduled checks. The interface is available in 32 languages, including Czech, German, and Greek.
Summary written by a language model from the project’s public pages.
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