Is XDM Browser Monitor safe?

Medium risk

XDM Browser Monitor collects cookies and request headers for intercepted downloads and sends them to the local XDM app via plaintext HTTP.

When a download is triggered, the extension captures all request and response headers — including Authorization and Cookie headers — and posts them to a local endpoint at http://127.0.0.1:9614. It also reads cookies for every linked URL on a page (not just the target download), meaning cookies from unrelated domains can be collected. All communication uses plaintext HTTP on localhost, with no transport-layer protection.

subhra74v2.2Firefox Add-ons
50Risk
Who publishes it

subhra74 - 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
subhra74

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

Publishers can request a review.

Findings

Download-all-links collects cookies for every linked URL.

MediumunwantedCWE-200Dynamic sandbox

When you use download-all-links, the extension collects every hyperlink on the page, reads cookies for each link's domain, and posts the URL and cookie data to 127.0.0.1:9614/links, including links you never chose to download.

What actually happens

You did this

You use the download-all-links feature.

The extension did this

The extension collects every linked URL on the page and reads cookies for each linked URL's domain.

Captured request

POST127.0.0.1:9614/links

Fields in the request

  • Cookies for linked sites
    sessionid=d7f3a1b2-... (illustrative)

    Cookies can identify your sessions or account state for domains linked from the page.

  • Linked page URL
    https://example.com/download.zip (illustrative)

    Each URL shows which external pages appeared as hyperlinks on the active page, even if you did not select them individually.

What it can do

Permissions this extension asks for, as declared in version 2.2. 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

    *://*/*

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

    tabs

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

    cookies

  • Add items to the right-click menu

    contextMenus

  • Act on the current tab, but only after you click the extension

    activeTab

  • Watch every request your browser makes

    webRequest

  • Watch, block and rewrite every request your browser makes

    webRequestBlocking

Where it sends data

Destinations our analysis observed XDM Browser Monitor 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.

  • 127.0.0.1:9614

    XDM Browser Monitor sends data to 127.0.0.1:9614. No other extension we have analyzed sends data here.

Updated 2 November 2026amo-929143