MetaMask Legacy Web3

Adds MetaMask's legacy window.web3 API to your browser

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The MetaMask Legacy Web3 Chrome extension reinstates the deprecated window.web3 API previously provided by MetaMask. Although MetaMask stopped injecting window.web3 in December 2020 to boost security and performance, this change can disrupt older or unmaintained decentralized websites and applications (dApps).

By adding this extension alongside your MetaMask wallet, you regain compatibility with those legacy dApps without sacrificing the convenience of MetaMask. It ensures seamless interaction with blockchain sites that still rely on the legacy API, preserving accessibility to older Ethereum-based services without compromising security improvements.

Cryptocurrency Privacy & Security Developer Tools

By:: danfinlay
Daily users:: 1,640+ 37
Rating:: 4.32

(161) 2 new ratings
Version:: 1.0.2 Last updated: 2021-01-19
Version code:: 5165454
Creation date:: 2020-12-10
Risk:: Moderate risk impact Low risk likelihood
Size:: 99.63K
Email:: su*****@metamask.io
URLs:: Website ,Privacy policy
Full description:: See detailed description
Source:: Firefox Browser Add-ons
Updated:: 18 hours ago

Ranking

Other rankings

#276 in Web Development ▼ 2

#2 in metamask keyword 36

#2 in metamask wallet keyword 66

#4 in web3 keyword 48

#7 in legal keyword 2

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User reviews

Users express positive feelings towards the MetaMask Legacy Web3 add-on, describing it as 'the best' and a 'great app'. There are no reported issues or negative points from the reviews provided.

Pros

Users find the add-on to be very good or great.
Positive overall sentiment towards the add-on.

Cons

Recent reviews

by Nikko Suarez, 2025-05-17

nnnn

by Firefox user 18986969, 2025-05-13

by 天灭中共退党团队保平安, 2025-03-28

View all user reviews ›

Extension safety

Risk impact

MetaMask Legacy Web3 requires a few sensitive permissions. 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.
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****

Risk likelihood

MetaMask Legacy Web3 has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******

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