Last updated: 2026-06-19
Open Book Reader is designed to be completely private.
Nothing. The extension does not collect, store, or transmit any personal data, browsing history, or page content to us or any third party.
Core reading is fully local: article extraction and pagination (and the image-gallery layout) happen entirely in your browser, and the Mozilla Readability library is bundled inside the extension — nothing is fetched from external servers for reading.
The extension makes network requests in one case only: when you explicitly download images from the image-gallery mode. To save an image, or to bundle several into a ZIP, your browser fetches those image URLs (the same images the page already shows). This happens only on your action (clicking a download / ZIP button), the bytes go only to your device, and nothing is ever sent to the developer or any third party.
Your reading preferences (font size, theme, book width, spine width, line height) are stored using Chrome's storage.sync API. This data stays within your own browser profile and may sync across your signed-in devices via Google's account sync. It is never sent to the developer.
Requested at install (the minimal set):
Optional — requested only the first time you download an image, never at install:
<all_urls>) — used only to fetch image bytes when you ask to download a ZIP of selected images. It is never used to read, monitor, or transmit page content.The extension only runs when you click its icon or press its keyboard shortcut. It does not run in the background or on pages you have not activated it on.
For questions about this policy, open an issue at the project's repository or email the developer.