Is uBlock safe?
uBlock sends daily encrypted per-domain telemetry to eyeo's servers and a persistent-UUID ping to ublock.org with OS and browser details.
On every top-level navigation, uBlock records page-view and ad-blocking counts per domain and encrypts them daily before POSTing to ublock.telemetry.eyeo.com. Separately, it transmits a once-daily stats ping carrying a persistent random UUID, OS, browser version, and language to ping.ublock.org. The eyeo CDP telemetry is enabled by default with no user-facing opt-out toggle; the ping.ublock.org response can also instruct the extension to open a tab to an ublock.org URL.
Part of this rating comes from analysis signals we haven't published as detailed findings yet.
Who publishes ituBlock - no other listings under this identity, 3 shared hostnames
uBlock - no other listings under this identity, 3 shared hostnames
What this publisher told the store about itself, and the other listings that told it the same thing.
Shared hosts - 3 hostnames
Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.
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 25.5.0. 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
*://*/*
Schedule its own background tasks
alarms
Block and redirect the requests your browser makes
declarativeNetRequest
See which of your requests its blocking rules matched
declarativeNetRequestFeedback
See the address and title of every tab you have open
tabs
Watch every request your browser makes
webRequest
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
Run its own code inside the pages you visit
scripting
Where it sends data
Destinations our analysis observed uBlock 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.
- ping.ublock.org
uBlock sends data to ping.ublock.org. One other extension we have analysed sends data here.
- ublock.telemetry.eyeo.com
uBlock sends data to ublock.telemetry.eyeo.com. One other extension we have analysed sends data here.