Is Coupert Guard - Ad blocker & Cash Back Guard safe?

Medium risk

Coupert Guard lets any website change its ad-blocking settings through a page-accessible message bridge.

Coupert Guard runs content scripts on every HTTP and HTTPS page and accepts same-window messages labeled as ad-block web settings. A visited website can use that bridge to update stored filtering settings, including placing all URLs in the no-filtering bucket and disabling ad blocking globally.

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

Coupert.comv1.0.16Chrome Web Store
46Risk
Who publishes it

Coupert Science LLC - 3 other listings from the same operator, 3 of them carrying a finding

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

Publisher
Coupert.com
Declared legal entity
Coupert Science LLC
Registered address
8 The Green, Ste A, Dover, DE 19901, US
Registered contact
Jimmy Zhao
Website
help.coupert.com/coupert-guard/coupert-guard-features-setup-guide/

Same store account

3 other listings published from this account, 3.1M+ users between them. 3 of them carry a finding.

Coupert3.0M+MediumCoupert Pure: AI-Powered Coupons & Price Compare70k+MediumCoupert UK - Auto Coupon Finder & Cashback8k+Medium

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 1.0.16. 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

    http://*/*

  • Read and change your data on every secure site you visit

    https://*/*

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

    cookies

  • Store data in your browser

    storage

  • Store an unlimited amount of data in your browser

    unlimitedStorage

  • Schedule its own background tasks

    alarms

  • Block and redirect the requests your browser makes

    declarativeNetRequest

  • See which of your requests its blocking rules matched

    declarativeNetRequestFeedback

  • Run its own code inside the pages you visit

    scripting

  • Watch every request your browser makes

    webRequest

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

    webNavigation

  • See, disable and uninstall your other extensions, including your security ones

    management

  • Run hidden pages in the background

    offscreen

declarativeNetRequestWithHostAccess
Updated 30 September 2026dgjkdnoemdeeeenekdkoelebmlafjbpk