Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of QuickManager: Fantasy for Sleeper

QuickManager: Fantasy for Sleeper by QuickManagerFantasy

Run all of your Sleeper fantasy football leagues from one tab. Autosub replaces ruled out starters before kickoff, and you get a live scoreboard, lineup optimizer, waiver tools, trades across every league and power rankings.

Some features may require paymentSome features may require payment
Available on Firefox for Android™Available on Firefox for Android™
5 (1 review)5 (1 review)
7 Users7 Users
Download Firefox and get the extension
Download file
Scan the QR code to open this extension in Firefox for Android

Extension Metadata

Screenshots
Autosub replaces a starter who gets ruled out before kickoff, with a different bench player in each league.Choose how much autosub does on its own: Log only, Approval or Away Mode.Live scores and win probability for every matchup, with each player's points and stat line.The Gameday board shows every lineup in kickoff order, and only what needs a decision.Simulate the rest of the season in every league for real playoff odds.The lineup optimizer finds the points left on your bench in every league and sets the best lineup everywhere.Lineup Upgrades finds the free agents who would start for you this week and builds the waiver claim.The trade simulator shows what a trade does to your playoff odds, before and after.
About this extension
QuickManager runs all of your Sleeper leagues from one tab. Set lineups, handle injuries, work the waiver wire and review trades across every league at once, instead of opening them one at a time.

NEW IN 2.0: AUTOSUB
NFL teams announce inactives about 90 minutes before kickoff. If one of your starters is ruled out and you are not at your phone, that slot scores zero. Autosub watches the leagues you pick during that window. When a starter is ruled out, it puts your best available bench player in his place. It fills empty slots, and it can move players who are out onto IR to free up a bench spot.

You decide how much it does on its own.
Log only: records what it would have done and changes nothing.
Approval: asks you before each change, with an optional timer that applies it if you have not answered in time.
Away Mode: makes the changes without asking.

Everything it does goes to an inbox, grouped so one injury across four leagues reads as one line. When it cannot fix a slot, for example because everyone who could play there has already kicked off, it tells you that too. It never makes waiver claims, never drops a player you have not marked as droppable, and never moves anyone off your taxi squad. Autosub runs while QuickManager is open in your browser, so leave the tab open on game day. Autosub is part of Pro.

LIVE SCOREBOARD
Every matchup you are in, with live scores and your chance of winning from here. Open a matchup to see each player's points, projection and stat line as his game goes on. On a computer you can pop the scoreboard out into its own window and keep it on a second screen.

LINEUP OPTIMIZER
Scan every league and see how many points are sitting on your bench, then apply the best lineup everywhere with one click. It uses each league's own scoring and handles bye weeks and injuries. It never moves a player whose game has already started, and it can put your latest kickoffs in FLEX so you still have options after the early games.

GAMEDAY BOARD
Every lineup you manage, in kickoff order, showing only what needs a decision: a starter who is out, an empty slot, or an upgrade worth making. Each move names both players and what it is worth in that league. Apply one, or tick the ones you like and apply them all.

WAIVERS
Put the players you want on one list and see which of your leagues each one is available in. QuickManager builds the claims and you choose the drops and bids. Edit or cancel claims you already sent. Free Agent Radar finds the best unowned players across your leagues, Lineup Upgrades points out the free agents who would actually start for you this week, and Mass Drop cuts a player from every league in one step.

TRADES
Find trade partners across all of your leagues and review every pending offer in one place. Accept, decline, counter or withdraw without switching leagues. Before you say yes, simulate thousands of seasons for both teams to see what the trade does to each side's playoff odds.

POWER RANKINGS AND STANDINGS
Simulate the rest of the season in every league for real playoff odds. See how your roster ranks at each position against the rest of the league, which of your leagues still deserve your attention, and full standings for all of them. Leagues that also play the league median every week are counted correctly.

ROSTER HEALTH
Every league is checked against its own IR and taxi rules. Move everyone eligible to IR in one pass. If a roster breaks its league's rules, QuickManager finds it and fixes what it can, and nobody is dropped unless you say so.

FREE AND PRO
The free plan runs the lineup, waiver, trade and rankings tools on up to five leagues. Pro adds all of your leagues, autosub and league filters, and starts with a 7 day free trial.

PRIVATE
Your Sleeper login stays in your browser. QuickManager has no server and does not collect your data. The extension talks to Sleeper directly from your own computer.

QuickManager is an independent tool. It is not affiliated with, endorsed by or sponsored by Sleeper. The Sleeper name is used only to describe what the extension works with.
Rated 5 by 1 reviewer
Log in to rate this extension
There are no ratings yet

Star rating saved

5
1
4
0
3
0
2
0
1
0
Read 1 review
Permissions and data

Required permissions:

  • Access your data for sleeper.com
  • Access your data for www.sleeper.com
  • Access your data for extensionpay.com

Optional permissions:

  • Access your data for sites in the sleeper.com domain
  • Access your data for sleeper.com
  • Access your data for api.sleeper.app
  • Access your data for extensionpay.com

Required data collection, according to the developer:

  • Authentication information

Optional data collection, according to the developer:

  • Personal communications
Learn more
More information
Add-on Links
  • Homepage
  • Support site
  • Support Email
  • Copy add-on ID
Version
2.0.2
Size
627.99 KB
Last updated
2 days ago (Sep 16, 2026)
Related Categories
  • Alerts & Updates
  • Games & Entertainment
License
All Rights Reserved
Privacy Policy
Read the privacy policy for this add-on
Version History
  • See all versions
Add to collection
Report this add-on
Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Download

  • Download Firefox
  • Windows
  • macOS
  • iOS
  • Android
  • Linux
  • All

Latest Builds

  • Nightly
  • Beta

Firefox for Business

  • Enterprise

Community

  • Connect
  • Contribute
  • Developer

Follow

  • Instagram
  • YouTube
  • TikTok
  • Bluesky
  • Podcast
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version. Android is a trademark of Google LLC.