Is Popup Blocker (strict) safe?

Medium risk

Popup Blocker (strict) intercepts and blocks popup and tab-open requests on every page, presenting a confirmation UI that any page script can inject fake entries into.

The extension injects a content script on all URLs that captures window.open and tab-creation calls before they execute, then renders a confirmation iframe asking the user whether to allow, deny, or redirect each popup. The confirmation iframe registers a postMessage listener with no origin check, meaning any page can send crafted requests into it and cause the UI to display attacker-controlled entries; if the user clicks Allow on one, the extension opens the attacker-supplied URL via chrome.tabs.create.

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

Jeremy Schomeryv0.9.3Firefox Add-ons
42Risk
Who publishes it

Jeremy Schomery - no other listings under this identity, 1 shared hostname

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

Publisher
Jeremy Schomery

Shared hosts - 1 hostname

Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.

rds.live
Also called by 2 other listings, including Popup Blocker (strict)

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 0.9.3. 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>

  • Store data in your browser

    storage

  • Run its own code inside the pages you visit

    scripting

Updated 2 November 2026amo-742681