Is Adblocker X safe?

Medium risk

Adblocker X fetches addonsrv.net rules that can inject controller iframes into matching websites and alter page content.

Adblocker X downloads remote recommendation and request-header rules from addonsrv.net after startup. On matching websites, those rules can insert an iframe whose URL includes the current page URL, then let that iframe message the content script to clone, remove, rewrite, style, and add click handlers to page elements. The same remote configuration can add a From: @nrs header to matching outgoing web requests.

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

Adblock57v2.0.6resigned1Firefox Add-ons
45Risk

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 2.0.6resigned1. 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>

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

    tabs

  • Add items to the right-click menu

    contextMenus

  • Watch every request your browser makes

    webRequest

  • Watch, block and rewrite every request your browser makes

    webRequestBlocking

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

    webNavigation

  • Store data in your browser

    storage

  • Store an unlimited amount of data in your browser

    unlimitedStorage

  • Show you desktop notifications

    notifications

Where it sends data

Destinations our analysis observed Adblocker X 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.

  • www.addonsrv.net

    Adblocker X sends data to www.addonsrv.net. One other extension we have analysed sends data here.

Updated 30 September 2026amo-855221