Chess.com Highlighter Firefox

Chess.com Highlighter

By: e4e5
Highlights attacked and hanging pieces, attackers, defenders, and potential movement squares.

Features & Capabilities

This extension is designed to provide an enhanced learning experience for beginner and intermediate chess players on chess.com. Acting as "training wheels" for people new to the game, it offers visual aid that help players improve their understanding of chess fundamentals.

Default Features:

🔹 Highlight Hanging & Attacked Pieces
    Automatically identify which squares are hanging and under attack by you and your opponent.

Additional Features:

🔹 Highlight Movements (Safe, Attacked, Hanging)
    See which squares are safe, attacked, or will leave your piece hanging before you make your move. Additionally, squares that result in stalemate or checkmate are highlighted.

🔹 Highlight All Attacking & Defending Pieces
    Select (right-click) any square on the board to highlight its attackers and defenders.

🔹 Evaluation Bar (still testing)
    Intended as a feature to give players hints in case they are missing something very obvious. It does not recommend moves.

Note: Do not use Piece Animations: 'Natural' and 'Arcade'. For some features to work, the 'Highlight Moves' and 'Show Legal Moves' settings need to be turned on.

Includes a 3-day free trial for the Additional Features.

If you encounter any issues or have suggestions for new features, please contact me at chesshighlighter@gmail.com

Update Log: v1.1.0 -- added evaluation bar, added stalemate and checkmate to highlight movements, added toggles for features v1.0.1 -- some performance optimizations

User Growth & Download Statistics

Manifest V3 Add-on
By:
e4e5
Daily users:
27 1
Rating:
3.00
(2)
Version:
1.1.1 Last updated: 2024-11-18
Version code:
5844654
Creation date:
2024-11-15
Risk:
Moderate risk impact Moderate risk likelihood
Permissions:
Host permissions:
  • https://api.lemonsqueezy.com/*
  • https://chess-api.com/*
  • https://stockfish.online/*
Content scripts matches:
  • www.chess.com
Size:
32.09KB
Email:
ch*****@gmail.com
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-06-19
Compare stats and ranking:

Other platforms

Chrome
Chess.com Highlighter (v1.1.4)
835 4.14 (7)

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.
Developed by:
e4e5
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/chess-com-highlighter/
Email:
ch*****@gmail.com

User Reviews

Features are paywalled behind a license. Do not use.
by co*****, 2026-03-11

OMG, this is sooooooooo gooooooddddddddd. It works so ooooooooo weelllllllll
by *****, 2025-07-31
View all user reviews ›

Is Chess.com Highlighter Safe?

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Chess.com Highlighter requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details
  • High Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.
  • Medium ******* ****** ** *** ********* ******** ********** ***************** ************** ****************
Risk likelihood
Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Chess.com Highlighter is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Medium **** ********* *** *** **** *******
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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