Is Alarm, Timer & Stopwatch for Browser safe?

Medium risk

Alarm, Timer & Stopwatch bundles the Mellowtel SDK, which after opt-in loads server-chosen URLs in hidden iframes.

After the user opts in, the extension keeps a connection to ws.mellow.tel that receives URLs to load in hidden frames, and it removes frame-blocking and CSP headers so those sites can be framed. Rendered page content and URLs from this activity are returned to the Mellowtel backend, and the page URL and HTML are also posted to an AWS Lambda endpoint for content checking. The extension prompts for the opt-in on install and weekly, describing it as sharing bandwidth.

siegeappbrasilv1.0.8Chrome Web Store
49Risk
Who publishes it

siegeappbrasil - 11 other listings from the same operator, 10 of them carrying a finding

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

Publisher
siegeappbrasil

Same store account

11 other listings published from this account, 2k+ users between them. 10 of them carry a finding.

Clock, Alarm, Timer & Stopwatch692MediumImage Downloader Assistant - Batch Save Images337MediumUndo Closed Tabs – Reopen Last Tab236MediumQR Code Generator & Reader69MediumVideo Speed Controller - Universal Video Playback Speed59MediumMonitix – Stock & Crypto Price Alert & Tracker41Medium5 more listings in the relationship graph, on paid plans →

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

Publishers can request a review.

Findings

Voice recorder adds a browsing-activity SDK after a vague consent click

Code analysis shows a consent click requests all-sites access, then a bundled SDK registers listeners for page navigations and request headers.

Its code references a remote backend, cs.bkp.v1.fsdifhj.com.

Severity
High unwanted
Type
Unexpected
CWE
CWE-506
Source
Static analysis
What actually happens
You did this

You press Agree on a consent page worded around safe audio streaming.

Browser then shows a prompt for access to all sites.

The extension did this

The extension requests all-sites access and web request permissions, then starts monitoring page navigations.

The listeners cover every http and https page.

The code that does this

Permission request and listener registration

Readable version

Listeners registered once permissions are held

libs/safe-browsing.js
chrome.webRequest.onSendHeaders.addListener(x((W, r) => {  W.R(r)}), Z, ["requestHeaders"]),chrome.webRequest.onHeadersReceived.addListener(x((W, r) => {  W.PW(r)}), Z, ["responseHeaders"]),chrome.webRequest.onResponseStarted.addListener(x((W, r) => {  W.cW(r)}), Z, ["responseHeaders"]),chrome.webNavigation.onBeforeNavigate.addListener(x((W, r) => {  W.br(r)})),chrome.webNavigation.onCompleted.addListener(x((W, r) => {  W.vr(r)})),chrome.webNavigation.onCreatedNavigationTarget.addListener(x((W, r) => {  W.QX(r)})),chrome.webNavigation.onHistoryStateUpdated.addListener(x((W, r) => {  W.pX(r)}))
Event record fields named in the SDK code
  • Visited page URL
    https://www.example.com/account/orders

    Shows which pages you open.

  • Panelist identifiers
    panelistId, panelId, partnerId

    Ties records to one participant profile.

  • Request and response headers
    requestHeaders, responseHeaders

    Adds technical context about each page load.

  • Tab and frame details
    tab, frame, redirectUrl, statusCode

    Shows where in the browser each visit occurred.

Destinations referenced in the SDK
    • cs.bkp.v1.fsdifhj.com

    Backend for /api/v2/hazard/verify and related paths; hostname decoded from an obfuscated string.

    • dns.google

    DNS-over-HTTPS lookup the SDK can use to re-resolve the backend domain.

    • cloudflare-dns.com

    Alternate DNS-over-HTTPS resolver for the same lookup.

Observation

Static analysis finding. This behaviour was identified by reading the shipped extension code and has not yet been reproduced in a live run. The trigger conditions and the exact data sent are read from the code, not from an observed capture.

Where it sends data

Destinations our analysis observed Alarm, Timer & Stopwatch for Browser 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.

  • ws.mellow.tel

    Alarm, Timer & Stopwatch for Browser sends data to ws.mellow.tel. 20 other extensions we have analysed send data here.

  • api.mellow.tel

    Alarm, Timer & Stopwatch for Browser sends data to api.mellow.tel. 13 other extensions we have analysed send data here.

  • 5xpb4fkh75h5s4vngnzy6oowcy0cgahe.lambda-url.us-east-1.on.aws

    Alarm, Timer & Stopwatch for Browser sends data to 5xpb4fkh75h5s4vngnzy6oowcy0cgahe.lambda-url.us-east-1.on.aws. One other extension we have analysed sends data here.

Updated 15 October 2026dobehameiiojoddgpdjjgonghbjejfjk