Conch FF — Privacy Policy
Last updated: July 19, 2026

Conch FF (“the extension”) is a browser extension that enhances the Sleeper fantasy football website with richer stats and a cleaner layout. Conch FF is an independent project and is not affiliated with, endorsed by, or sponsored by Sleeper.

The short version
Conch FF does not collect, sell, or share your personal information. It has no analytics and no tracking. Most of what the extension does happens locally in your own browser. One feature — trade-history enrichment — talks to a backend service operated by the developer (FF TV Guide): it sends the league ID of the Sleeper league you are viewing so the service can return that league’s trade history. You can turn this feature off in the extension popup (“Trade history enrichment”), and no other feature contacts the developer’s servers.

What data the extension accesses
When you view a page on sleeper.com, Conch FF reads the fantasy football data that page already deals with (your leagues, rosters, matchups, and standings) so it can display it more usefully. To enrich that view it fetches additional publicly available data directly from these APIs, from your browser:

Sleeper public API (api.sleeper.app, api.sleeper.com) — league, roster, matchup, and player information.
Sleeper CDN (sleepercdn.com) — player avatars and images.
FantasyCalc public API (api.fantasycalc.com) — dynasty player and draft-pick trade values.
These requests contain only the public identifiers needed to look up that data (for example, a league ID or player ID). They do not include your name, email, password, or any account credentials.

The FF TV Guide backend (trade-history enrichment)
When the “Trade history enrichment” feature is enabled (it is by default) and you open a league’s transactions tab, the extension contacts the developer-operated FF TV Guide API to fetch that league’s historical trades — including which players traded draft picks eventually became, which Sleeper does not show.

What is sent: the Sleeper league ID of the league you are viewing, and an anonymous authentication token. The extension signs in to the service anonymously (via Firebase Authentication); this anonymous identity is random, is not linked to your Sleeper account, your name, or your email, and is used only to authenticate requests and enforce fair-use rate limits.
What is received: that league’s trade history, assembled by the service from Sleeper’s public API.
What the service stores: league-level fantasy data (leagues, trades, drafts) fetched from Sleeper’s public API — the same information visible to every member of the league on Sleeper. The service does not receive or store your personal information, browsing history, or any page content beyond the league ID.
What is never sent: your name, email, credentials, cookies, browsing history, or any data from non-Sleeper sites.
Turning the feature off in the popup stops all communication with the FF TV Guide backend.

What data the extension stores
To stay fast and reduce network requests, Conch FF caches data locally in your browser using the standard extension storage APIs:

chrome.storage.local — a cached copy of the NFL player dictionary, short-lived league/matchup data, and the anonymous FF TV Guide authentication token described above.
chrome.storage.sync — your Conch FF settings (which features are turned on). If you are signed into Chrome, your browser may sync these settings across your own devices; this is handled entirely by Chrome, not by Conch FF.
You can clear all of it at any time by removing the extension.

What data the extension shares
Nothing is sold or shared with advertisers, analytics providers, or data brokers. The only party the extension communicates with beyond the public APIs above is the developer-operated FF TV Guide service, exactly as described in the previous section.

Permissions
storage / unlimitedStorage — to cache the player dictionary and your settings locally, as described above.
Host access to sleeper.com, the Sleeper APIs/CDN, and the FantasyCalc API — to read the page you’re viewing and fetch the public data that powers the enhancements.
Host access to the FF TV Guide API (ff-tv-guide-507152681487.us-east4.run.app) — to fetch trade-history enrichment, as described above. Conch FF requests access to no other sites.
Changes to this policy
If this policy changes, the “Last updated” date above will change and the new version will be published at this URL.

Contact
Questions about this policy can be sent to iam@tedmoke.com.