Browser Extension Privacy Policy
Last updated: 2026-04-30 · Applies to the Item Value Checker browser extension v0.1.0 and later.
Plain-English summary
The Item Value Checker browser extension processes images you choose to value-check — images you upload, paste, right-click, or scroll past on Facebook Marketplace. It sends those images to our backend server to query eBay's public listing data. It does not collect your browsing history, login credentials, or any personal information.
What the extension does with data
| Data | When collected | How used | Retained? |
|---|---|---|---|
| Images you select | Only when you act | Sent to our backend, then to eBay's image search API to find similar listings | Cached client-side only (chrome.storage.local); never stored on our servers beyond the duration of the API request |
| Images visible on Facebook Marketplace | Only when overlay is enabled and you visit facebook.com/marketplace | Same as above — sent to our backend to estimate value | Cached client-side only |
| Image URLs (hashed) | When images are processed | Used as cache keys in chrome.storage.local; never sent to our servers as URLs (only image bytes are sent) | Until cache TTL (24h) or extension uninstalled |
| Extension settings | When you change a setting | Persisted in chrome.storage.sync (synced across your Chrome profile) | Until you uninstall the extension or change the setting |
What the extension does NOT do
- Read or transmit your browsing history
- Read or transmit cookies, login tokens, or session data
- Track which sites you visit (beyond fetching images you've already loaded)
- Send analytics about your usage to any third party
- Send personally identifiable information of any kind
- Sell, share, or transfer data to third parties
Network requests
The extension makes network requests to:
- https://pricelens-production.up.railway.app/estimate — our backend API. We send the image bytes (base64-encoded). The backend forwards them to eBay's image search API and returns aggregated estimated value data. We do not log image content or associate requests with any user identity.
- The websites you visit — when the FB Marketplace overlay is enabled, the extension reads images already loaded on the page (no extra network request beyond what your browser already made). When you right-click an image, the extension fetches that image's URL once.
Permissions explained
Per the extension's manifest.json:
contextMenus— to add the right-click "Check value" menu itemactiveTab— to open the popup tab from the context menustorage— for the local image-result cache and the overlay on/off settingscripting— reserved for future content-script features<all_urls>— required so right-click works on images from any site, and so the FB Marketplace content script can read images from facebook.com. We do not exfiltrate data from any site beyond the image you explicitly interact with.
Third parties
Image bytes you submit are forwarded to eBay's API (specifically eBay's Browse API search_by_image endpoint) to find similar listings. eBay's privacy policy applies to that processing. See eBay's Privacy Policy.
The Item Value Checker backend infrastructure runs on Railway. See Railway's Privacy Policy.
Children's privacy
The extension is not intended for users under 13. We do not knowingly collect data from children.
Changes to this policy
If this policy changes, we will update the version date at the top of this page and announce changes in the extension's release notes. Continued use of the extension after changes constitutes acceptance.
Contact
Questions or concerns: support@itemvaluechecker.com