Is Lync safe?

Low risk

Lync lets any web page replace its stored login token and clear cookies for a backend-chosen site.

Lync connects users to online services through the letslync.com backend. Its content script runs on every http(s) page and relays a window message from the page to the background script, which overwrites the stored API key, requests module settings from app.letslync.com, and deletes cookies for the URL the server returns. It then opens that URL in a new tab and fills fields or clicks elements as the server config directs.

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

Haatch Interactivev1.0.22Firefox Add-ons
17Risk
Who publishes it

Haatch Interactive - 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
Haatch Interactive

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 1.0.22. 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

    https://*/ and 1 more

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

    cookies

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

    tabs

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

    activeTab

  • Write to your clipboard

    clipboardWrite

menus

Where it sends data

Destinations our analysis observed Lync 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.

  • app.letslync.com

    Lync sends data to app.letslync.com. No other extension we have analysed sends data here.

Updated 15 October 2026amo-2633620