MetaMask

Ethereum Browser Extension

MetaMask: The Essential Ethereum Browser Extension

MetaMask is an innovative Firefox add-on serving as a fully functioning Ethereum wallet in your browser. This extension plays a crucial role in accessing Ethereum enabled distributed applications, or 'Dapps'. It injects the Ethereum web3 API into every website's javascript context to allow dApps to retrieve information from blockchain. It also allows users to create and manage their own Ethereum identities, facilitate transactions and interact securely with dApps.

Add-on stats

By: danfinlay
Daily users: 455,718
-1,062
Version: 12.6.2 (Last updated: 2024-12-16)
Creation date: 2016-08-17
Weekly download count: 8,196
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood:
Manifest version: 2
Permissions:
  • storage
  • unlimitedStorage
  • clipboardWrite
  • http://*/*
  • https://*/*
  • activeTab
  • webRequest
  • webRequestBlocking
  • *://*.eth/
  • notifications
Size: 22.13M

Other platforms

MetaMask (v12.10.4)
2.93 (4,694) 16,000,000
MetaMask - Blockchain Wallet (v7.38.1)
4.50 (408,401) 37,503,582
MetaMask (v12.9.3)
3.50 (253) 3,106,183
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Add-on summary

An Ethereum Wallet in your Browser MetaMask is an extension for accessing Ethereum enabled distributed applications, or "Dapps" in your browser!

Watch an introductory video here.

The extension injects the Ethereum web3 API into every website's javascript context, so that dapps can read from the blockchain.

MetaMask also lets the user create and manage their own identities (via private keys, local client wallet and hardware wallets like Trezor™), so when a Dapp wants to perform a transaction and write to the blockchain, the user gets a secure interface to review the transaction, before approving or rejecting it.

Because it adds functionality to the normal browser context, MetaMask requires the permission to read and write to any webpage. You can always "view the source" of MetaMask the way you do any Chrome extension, or view the source code on Github: https://github.com/MetaMask/metamask-plugin

Enables access to: Web 3.0 Dapps

See more

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • User-friendly interface for wallet management
  • Good for storing Ethereum-based tokens
  • Generally easy to add networks
Cons
  • Frequent issues with network connections
  • Requires constant reinstallation for proper functionality
  • High gas fees and lack of coin auto-conversion
Most mentioned
  • Connection issues when adding networks
  • Reinstallation required frequently
  • High transaction fees
User reviews

by Nanny, 2025-02-05

View all user reviews

Add-on safety

Risk impact

MetaMask 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

MetaMask has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details
  • Medium This extension was updated in the past 3 months. New updates may not be stable or safe.
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