Is RetailMeNot: Codes, Cash Back and Coupons safe?

Low risk

RetailMeNot: Codes, Cash Back and Coupons transmits full page DOM content from shopping and checkout pages to api.onsleek.ai via the Sleek SDK.

On allowlisted shopping sites, the extension captures the full DOM of product, cart, and checkout pages — including the page URL, title, and user agent — and sends this data to api.onsleek.ai endpoints for page classification, cart extraction, and coupon automation. The extension applies PII redaction regexes before sending, but transmits the serialized DOM string regardless. Its injected content script (f.js) also accepts postMessage commands from any parent frame without validating the message origin, exposing DOM capture and form-input operations to cross-origin callers.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

RetailMeNotv5.0.7Firefox Add-ons
21Risk
Who publishes it

RetailMeNot - no other listings under this identity

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
RetailMeNot

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

What it can do

Permissions this extension asks for, as declared in version 5.0.7. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Read and change your data on every site you visit

    <all_urls>

  • Read and change cookies, including the ones that keep you signed in

    cookies

  • Run its own code inside the pages you visit

    scripting

  • Store data in your browser

    storage

  • See the address and title of every tab you have open

    tabs

  • See every page you navigate to, as you navigate to it

    webNavigation

  • Watch every request your browser makes

    webRequest

declarativeNetRequestWithHostAccess

Where it sends data

Destinations our analysis observed RetailMeNot: Codes, Cash Back and Coupons contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • api.onsleek.ai

    RetailMeNot: Codes, Cash Back and Coupons sends data to api.onsleek.ai. 4 other extensions we have analyzed send data here.

Updated 2 November 2026amo-917247