MetaMask Flask

Name: MetaMask Flask
Rating: 4.6 (10 reviews)
Author: MetaMask Labs

By: MetaMask Labs

The frontier of Ethereum wallets, in your browser

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Features & Capabilities

MetaMask Flask is the developer-focused canary distribution of the MetaMask browser extension. It exposes experimental and unstable APIs so developers can prototype, test, and debug advanced dApp integrations and new wallet features before changes reach the production release. Flask is built to maximize developer control and surface what teams need from a programmable wallet.

Flask offers core MetaMask functionality — buy, sell, swap, and earn — plus broad multi-chain and token support (Ethereum, Polygon, BSC, Arbitrum, Solana, Bitcoin, and more). It retains MetaMask’s industry-leading security and privacy controls, including transaction previews, live threat surveillance, MEV protection, and configurable privacy settings. Intended for developers and testing only; source code, privacy policy, and production MetaMask links are available for review.

User Growth & Download Statistics

Add-on Cryptocurrency Developer Tools Privacy & Security

By:

Daily users:

Rating:

Version:

13.34.1.150 Last updated: 2026-06-10

Version code:

6299256

Creation date:

2021-11-17

Risk:

Permissions:

Content scripts matches:

*
connect.trezor.io

Size:

24.16MB

Email:

su*****@metamask.io

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-23

Compare stats and ranking:

Ranking

# 15,264 ▼ 634

Other rankings

#3 in metamask keyword 38 #52 in ethereum keyword 18 ▼ 2#181 in nft keyword 6 ▼ 1#203 in bitcoin keyword 34 ▼ 1

For Developers

Monetize with App Pass Boost with Extension Booster

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:

MetaMask Labs

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/metamask-flask/

Email:

su*****@metamask.io

Website:

https://support.metamask.io

Permission Change History

2026-04-11: Version 13.19.0.150 → 13.25.0.150

Add Permissions: cookies

2025-08-12: Version 12.22.2.150 → 13.0.1.150

Add Permissions: identity

2025-07-14: Version 12.20.0.150 → 12.22.1.150

Add Optional permissions: clipboardRead

2025-01-21: Version 12.9.0.150 → 12.10.1.150

Add Permissions: ws://*/* wss://*/*

2024-10-03: Version 12.1.1flask0 → 12.3.1.150

Add Permissions: http://*/* https://*/* webRequestBlocking

Remove Permissions: http://localhost:8545/ https://*.infura.io/ https://*.codefi.network/ https://*.cx.metamask.io/ https://chainid.network/chains.json https://lattice.gridplus.io/*

2024-04-16: Version 11.13.1flask0 → 11.14.0flask0

Add Permissions: https://*.cx.metamask.io/

2023-03-07: Version 10.23.2flask0 → 10.25.0flask0

Add Permissions: https://*.codefi.network/

2022-07-26: Version 10.14.7flask0 → 10.18.0flask0

Add Permissions: https://chainid.network/chains.json

User Reviews

by Fi*****, 2025-11-17

by Fi*****, 2025-11-16

View all user reviews ›

Is MetaMask Flask 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.

MetaMask Flask requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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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.

MetaMask Flask is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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