Is CLIFL (YTMonster) safe?

Low risk

CLIFL (YTMonster) sends your signed-in YouTube account email or handle to clifl.com with each request.

The extension reads the email or channel handle of the YouTube account you are signed in to and attaches it to every request to its servers. It also follows task instructions from clifl.com and app2.ytmonster.ru that tell it which parts of YouTube pages to read, including video frames and page text, and uploads the results. Server-supplied URLs are also inserted into code run in the YouTube tab.

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

Firefox user 13198277v4.0.4Firefox Add-ons
18Risk

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 4.0.4. 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 youtube.com

    *://*.youtube.com/*

  • Read and change your data on ytmonster.ru

    *://*.ytmonster.ru/*

  • Read and change your data on clifl.com

    *://*.clifl.com/*

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

    tabs

  • Watch every request your browser makes

    webRequest

  • Watch, block and rewrite every request your browser makes

    webRequestBlocking

  • Store data in your browser

    storage

  • Block and redirect the requests your browser makes

    declarativeNetRequest

Where it sends data

Destinations our analysis observed CLIFL (YTMonster) 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.

  • app2.ytmonster.ru

    CLIFL (YTMonster) sends data to app2.ytmonster.ru. One other extension we have analysed sends data here.

  • clifl.com

    CLIFL (YTMonster) sends data to clifl.com. One other extension we have analysed sends data here.

Updated 15 October 2026amo-839723