Is CF-Predictor safe?
CF-Predictor reads every contestant handle from a Codeforces standings page and sends them to its own server to compute rating predictions.
On any Codeforces contest standings page, the extension scrapes all visible contestant handles and the contest ID, then forwards them to cf-predictor.wasylf.xyz to fetch predicted rating deltas, which it overlays on the page. The data is public Codeforces handles, not credentials or personal information. The background service worker also runs a fetch relay that retrieves any URL passed to it and returns the response body, so any script running on a standings page can use the extension to make cross-origin requests.
Who publishes itWsl_F - no other listings under this identity, 1 shared hostname
Wsl_F - no other listings under this identity, 1 shared hostname
What this publisher told the store about itself, and the other listings that told it the same thing.
Shared hosts - 1 hostname
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 1.3.2. 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 cf-predictor.wasylf.xyz
https://cf-predictor.wasylf.xyz/
Where it sends data
Destinations our analysis observed CF-Predictor 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.
- cf-predictor.wasylf.xyz
CF-Predictor sends data to cf-predictor.wasylf.xyz. One other extension we have analyzed sends data here.